Answer:
Metals which react with steam form the solid metal oxide and hydrogen gas.
In general, the more reactive the metal, the more rapid the reaction. Aluminium is unusual, because it is a reactive metal that does not react with water. Its surface forms a protective layer of aluminium oxide that keeps water away from the metal below.
The apparatus used to react a metal with steam and collect the gas produced is shown below.
Answer:
This is because some metals like aluminium, zinc, iron do not react with hot/cold water ; they react only with steam to form a metal oxide and hydrogen.
Step-by-step explanation:
which ones are equalivilent to 2.5
10/-4
10/4
-10/-4
-5/-2
-5/2
5/2
Answer:
10/4, -10/-4, -5/-2, and 5/2
Step-by-step explanation:
These are equivalent.
plz help me??? (dont u feel like people r ignoring u?)
Answer:
yes all the time
Step-by-step explanation:
PLEASE HELP!!!
In a computer catalog, the diagonal distance of a computer monitor screen is labeled as 21 inches. If the screen measures 14 inches in height, what is the width of the screen?
A. 345 in.
B. 261 in.
C. 245 in.
D. 10 in.
Answer:
C
Step-by-step explanation:
The width of the screen is approximately 15.65 or √(245) inches. The correct answer would be an option (C).
What is Pythagoras's theorem?Pythagoras's theorem states that in a right-angled triangle, the square of one side is equal to the sum of the squares of the other two sides.
The height of the screen (AB) is 14 inches, and the diagonal distance (AC) is 21 inches.
AB² + BC² = AC²
We can use these values to solve for the width of the screen (x):
x² = 21² - 14²
x² = 441 - 196
x² = 245
To solve for x, we can take the square root of both sides of the equation:
x = √(245)
x ≈ 15.65
Thus, the width of the screen is about 15.65 or √(245) inches.
Learn more about Pythagoras's theorem here:
brainly.com/question/343682
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Becca has 115 students. Susana has 8 fewer students than Becca. Erika has 25 more students than Susana. How many students does Susana have? *
Answer: 107 students
Step-by-step explanation: 115 minus 8 is 107
Answer:
132
Step-by-step explanation:
becca have 115-8= 107 so 107+25= 132
Plz help this is 10 points
Answer:
9/7
Step-by-step explanation:
25 = 2c - 8.000000000000000000000
Answer:
c=33/2
Step-by-step explanation:
25+8=2c
33=2c
33/2=c
can someone help me on this please for brainliest?
The vertex of this parabola is at (1,3). Which of the following could be its
equation?
10
(1,3)
-10
10
- 10+
Answer:
C. [tex]x = 3\cdot (y-3)^{2}+1[/tex]
Step-by-step explanation:
From Analytical Geometry, the equation of a parabola with axis of symmetry parallel to the x-axis and centered in [tex]V(x,y) = (h,k)[/tex] is described below:
[tex]x-h = C\cdot (y-k)^{2}[/tex] (1)
Where:
[tex]x[/tex] - Independent variable.
[tex]y[/tex] - Dependent variable.
[tex]h[/tex], [tex]k[/tex] - Coordinates of the vertex.
[tex]C[/tex] - Vertex factor.
If we know that [tex]h = 1[/tex] and [tex]k = 3[/tex], then the equation of the parabola is:
[tex]x-1 = C\cdot (y-3)^{2}[/tex]
[tex]x = C\cdot (y-3)^{2}+1[/tex]
Therefore, the option that could be its equation is C.
The equation a=180(n-2)/n represents the angle measures, a, ina regular n- sided polygon. When the equation is solved for n, n is equal to a fraction with a denominator of a-180. What is the numerator of the fraction?
Answer:
-360
Step-by-step explanation:
Given:
[tex] a = \frac{180(n - 2)}{n} [/tex]
Solve for n. Multiply both sides by n
[tex] a*n = \frac{180(n - 2)}{n}*n [/tex]
[tex] an = 180(n - 2) [/tex]
Apply the distributive property
[tex] an = 180n - 360 [/tex]
Subtract 180n from both sides
[tex] an - 180n = - 360 [/tex]
Factor out n
[tex] n(a - 180) = - 360 [/tex]
Divide both sides by (a - 180)
[tex] n = \frac{-360}{a - 180} [/tex]
Therefore, the numerator of the fraction that n is equal to is -360
Michelle is working on a design for a new building. She has built a model of the building according to the client's specifications.
The height of the model is 15 inches, the slant height of the model is approximately 17 inches, and the base has a length of
14 inches and a width of 20 inches.
w
Note: picture not drawn to scale.
Michelle must order appropriate equipment to heat and cool the building, so she must use the model to determine how much
space there will be inside. What is the volume of her model? (Round to the nearest hundredth, if necessary.)
OA
5,600 cubic inches
OB
1,400 cubic inches
OC. 280 cubic inches
OD
980 cubic inches
Answer:
Step-by-step explanation:
980
A baby elephant weighs 200 pounds at birth. It gains 3 pounds every day. Write an equation that represents this situation.
Answer:
y=200+3x
Step-by-step explanation:
I hope that this helps you
Emily cuts two circles from a sheet of colored paper measuring 8" x 12". One circle
had a radius of 3 inches and the other had a diameter of 5 inches. How many square
inches of paper are left over? Is it possible to cut another circle with a 3 inch radius from
the paper? If the 3 inch circle fits what is the largest circle (What is its radius) you can
draw that will still fit on your paper.
Answer:
a. 48.1 square inches
b. yes
c. 2.51 in
Step-by-step explanation:
a. How many square inches of paper are left over?
To know this, we need to calculate the area of the sheet of colored paper and then subtract the are of the circle from it.
So, A = area of colored paper = 8" x 12" = 96 in²
A'= Area of 3 inch radius circle = πr²
= π(3)²
= 9π in²
A" = Area of 5 inch diameter circle = πd²/4
= π(5)²/4
= 25π/4 in²
= 6.25π in²
A₀ = area of circles = 9π in² + 6.25π in²
= 15.25π in²
= 47.91 in²
So, there are left A₁ = A - A₀
= 96 in² - 47.91 in²
= 48.09 in²
≅ 48.1 in²
So there are 48.1 square inches left over.
b. Is it possible to cut another circle with a 3 inch radius from the paper?
To know this, we calculate the area of a 3 inch radius paper and see if it is less or more than the remaining area of paper. If it is less, it can be cut.
So, A₂ = Area of 3 inch radius circle = πr²
= π(3)²
= 9π in²
= 28.3 in²
Since A₂ = 28.3 in² < A₁ = 48.1 in² (the rest of the colored paper area), it can be cut. So the answer is yes, another circle with a 3 inch radius can be cut from the paper.
c. If the 3 inch circle fits what is the largest circle (What is its radius) you can draw that will still fit on your paper.
We find the area of the remaining colored paper by subtracting the area of the 3 inch circle from the remaining area. So.
A₃ = A₁ - A₂
= 48.1 in² - 28.3 in²
= 19.8 in²
This is the area of the remaining colored paper. We then find the radius, r of the circle with area A₃ = 19.8 in² that would fit into the area.
So, A₃ = πr²
r = √(A₃/π)
= √(19.8 in²/π)
= √(6.302 in²)
= 2.51 in
22
Select the correct answer.
Which rational number is positive?
Ο Α. .
O
B.
C.
TI SI VA IT 13
OE.
Reset
Next
Answer:
[tex](c)\ \frac{6}{5}[/tex]
Step-by-step explanation:
The question is incomplete as it has missing options.
See attachment for complete question and options..
From the attachment, we have:
[tex](a)\ \frac{-7}{9}[/tex]
[tex](b)\ \frac{-8}{2}[/tex]
[tex](c)\ \frac{6}{5}[/tex]
[tex](d)\ \frac{3}{-2}[/tex]
All but 6/5 are negative numbers.
This is so because:
[tex](a)\ \frac{-7}{9}[/tex] has a negative sign at the numerator
[tex](b)\ \frac{-8}{2}[/tex] has a negative sign at the numerator
[tex](d)\ \frac{3}{-2}[/tex] has a negative sign at the denominator
Only [tex](c)\ \frac{6}{5}[/tex] has positive integers at the numerator and denominator.
i giveee brainlilsdtttt
den
URA - Add/sub/monomials Practice
<
8/17
>
Set background
Clear frame
Rectangle ABCD has a length represented by the expression 2x - 3, and a width
represented by the expression 4x + 5. Rectangle PQRS has a length represented by
the expression x - 1, and a width represented by the expression 3x + 2. Which are used to represent the difference in the perimeters of
Rectangle ABCD and Rectangle PQRS
Answer:
Perimeter of ABCD - Perimeter of PQRS = 4x + 2
Step-by-step explanation:
i. For rectangle ABCD;
length, l = 2x -3
width, w = 4x + 5
Perimeter of a rectangle = 2(l + w)
Perimeter of ABCD = 2((2x -3) + (4x + 5))
= 2(2x -3 + 4x + 5)
= 2(6x + 2)
Perimeter of ABCD = 12x + 4
ii. For rectangle PQRS;
length, l = x - 1
width, w = 3x + 2
Perimeter of a rectangle = 2(l + w)
Perimeter of PQRS = 2((x - 1) + (3x + 2))
= 2(x - 1 + 3x + 2)
= 2(4x + 1)
Perimeter of PQRS = 8x + 2
So that,
Perimeter of ABCD - Perimeter of PQRS = (12x + 4) - (8x + 2)
= 12x + 4 - 8x - 2
= 4x + 2
Perimeter of ABCD - Perimeter of PQRS = 4x + 2
Which graph best represents a decreasing function?
Answer:
It is C
Step-by-step explanation:
Just Finished the test and that's the answer
Andre had lots of Halloween candy. He ate the same amount of candy each day. After 10 days he had 115 pieces. After 18 days he had 43 pieces. How many will he have after 22 days?
9514 1404 393
Answer:
7 pieces
Step-by-step explanation:
In the 8 days between day 10 and day 18, Andre's candy decreased by 115-43 = 72 pieces. In the next 4 days (half the time of that decrease), we expect it to decrease by half that amount, so 72/2 = 36 pieces.
After 22 days, the amount remaining will be 43 -36 = 7 pieces.
2(3x-4)=(x+37)
I don't know how to do
Answer:
Step-by-step explanation:
Wow
1. Simplify the expression (n3)6
What single decimal multiplier would you use to increase by 7% followed by a 4% decrease?
Answer:
To increase an amount by 7%, you would want to use 1.07 as the multiplier. To decrease it, you would use 0.93
Step-by-step explanation:
5x^2 - 6x - 28 = 0
please help me do this
Answer:
x= 3 5 + 1 5 √149 or x= 3 5 + −1 5 √149
Can somebody help me out for brainliest please ?
Answer:
✔️(20, 16)
✔️(15, 12) = 15 pounds of beans cost $12
Step-by-step explanation:
✔️20 pounds of beans is represented by the ordered pair, (20, 16). On the graph, when beans (x) = 20 pounds, cost (y) = $16.
✔️Also, the ordered pair (15, 12) means that 15 pounds of beans cost $12. From the graph, when beans (x) = 15 pounds, cost (y) = $12.
How Do You get: 5(5x + 2x /5 x 8)<78
Answer:
x < 1.39285714286
Step-by-step explanation:
5(5x+2x/5x8)<78
x5 x5
5(5x+2x(8))<390
/8 /8
5(5x+2x)<48.75
5(7x)<48.75
/5 /5
7x < 9.75
/7 /7
x < 1.39285714286
Use the difference of squares identity to write this polynomial expression in factored form:
9x2 − 49.
Jermaine did this work to solve an equation. Did he make an error?
4x+6-r= 2x + 3
5x + 6 = 2x + 3
Answer:
First, I go by finding x and r.
After that, put the numbers (ie. x= # and r=#) into the equations. Check it by finding L.H.S and R.H.S. (ie. left hand side and right hand side)
If you are still confused, comment down and I'll try to provide better explanation!
Hello- GIve me a random math question Plz
(-9n+9+6n4)-6n-7n4) simplified?
The high temperatures for Monday and Tuesday are graphed on the number line below. The
high temperature on Wednesday is the least of the three days. Which inequality correctly
compares Wednesday's high temperature, w, with the temperatures graphed on the number
line?
-2
2
-1
0
1
High Temperatures (°C)
-0.5°C
w < -1.5 C
w > 0.5°C
-1.5 0
I need help
Francine rolls two 6-sided number cubes. What is the probability that she rolls
a sum equal to 6? Use the diagram of the sample space to help you.
Answer:
Option D
Step-by-step explanation:
Probability of an event = [tex]\frac{\text{Favorable outcome}}{\text{Total number of outcomes}}[/tex]
Favorable outcome = sum of numbers is 6 on rolling two cubes
= (5 + 1), (4 + 2), (3 + 3), (2 + 4), (1 + 5)
Therefore, number of rolls that she gets a sum of 6 = 5
Total number of outcomes = 6 × 6 = 36
Therefore, probability that she rolls a sum equal to 6 = [tex]\frac{5}{36}[/tex]
Therefore, Option D will be the answer.
I SUCK AT MTH PLS HELP 20 POINTS!!!
I'm stuck on the one with graphs...
