2) The number of textbooks the school bought this year was 25% more than the number
of books bought last school year. This school year we bought 185 textbooks. What
was the original number of textbooks

Answer: 46

Step-by-step explanation:

2 x 5 = 10

9 x 4 = 36

10 + 36 = 46

Answer:

46

Step-by-step explanation:

subsitute in x and y , so

2(5)+(9)4 = 10 + 36 = 46

Answer:

5x= in 8

Step-by-step explanation:

There is no other equation so i hope this is right

Answer:

The mean is 40

Step-by-step explanation:

(30 + 50)/2 = 40

Answer:

263?

Step-by-step explanation:

Answer:

7762

Step-by-step explanation:

product of 325 and 24 is 7800 so 7800-28=7762

Answer:

78 m

Step-by-step explanation:

We need to use the Pythagorean theorem, [tex]a^{2} + b^{2} = c^{2}[/tex].

Substitute in [tex]a[/tex] and [tex]b[/tex].

[tex]30^{2} + 72^{2} = c^{2}[/tex]

Simplify.

[tex]900 + 5184 = c^{2}[/tex]

Add.

[tex]6084 = c^{2}[/tex]

Square root both sides.

[tex]78 = c[/tex]

The hypotenuse is 78 m long.

find c:

a² plus b² = c

72² plus 30²=c

5I84 plus 900

6084

now square root that

78

so C=78

Answer:

if i am not mistaken i believe it is 0 √5 - 7x

Step-by-step explanation:

Answer:

the greatest common factor is 150

Answer:

it's composed of the digits 4 and 7

1) 7a: 7 times a number

2) 2a+3: 3 more than twice a number

3) 30d, 30 minutes times the number of days she practices.

Answer:

7/1000

Step-by-step explanation:

1 m = 1000 mm

Therefore,

Scale factor = 7/1000

Answer: 7ft

Step-by-step explanation:

i just did it

The maximum area covered will be 9 ft².

The region that a circle occupies in a two-dimensional space is known as the area of the circle.

The area of circle is -

A = πr²

Given:

The chemistry teacher decides to use chalk paint to cover a circular portion of a wall in the science lab.

If the greatest distance across the circle is is 3 feet.

We can write the maximum area covered as -

A = πr²

A = 3.14 x 3 x 3

A = 9 ft²  {approx.}

So, the maximum area covered will be 9 ft².

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Answer:

33/100

Step-by-step explanation:

{x,y} = {4, -3}

Substitution :

// Solve equation [2] for the variable  x  

 [2]    x = 4y + 16

// Plug this in for variable  x  in equation [1]

  [1]    (4y+16) + y = 1

  [1]    5y = -15

// Solve equation [1] for the variable  y  

  [1]    5y = - 15

  [1]    y = - 3

// By now we know this much :

   x = 4y+16

   y = -3

// Use the  y  value to solve for  x  

   x = 4(-3)+16 = 4

Answer:

b

Step-by-step explanation:

Answer:

37.7

Step-by-step explanation:

n - 0.47n = 20

0.53n = 20

n = 37.7

Answer:

−0.8x+4.8y+16

Step-by-step explanation:

4(0.5x+2.5y−0.7x−1.3y+4)

=(4)(0.5x+2.5y+−0.7x+−1.3y+4)

=(4)(0.5x)+(4)(2.5y)+(4)(−0.7x)+(4)(−1.3y)+(4)(4)

=2x+10y−2.8x−5.2y+16

=−0.8x+4.8y+16

Answer:

65

Step-by-step explanation:

15*3+15=60

30*2+15=75

20*4+15=85

10*5+15=65

Answer:

0.0381

Step-by-step explanation:

This is a binomial probability distribution problem. Thus;

p = 10% = 0.1

We are told that A random sample of 8 light bulbs are chosen and tested. Thus, n = 8

We want to find the probability that at least 3 are defective. This will be;

P(X ≥ 3) = P(3) + P(4) + P(5) + P(6) + P(7) + P(8)

P(X = x) = C(n, x) × p^(x) × (1 - p)^(n - x)

Thus;

P(3) = C(8, 3) × 0.1³ × (1 - 0.1)^(8 - 3)

P(3) = C(8, 3) × 0.1³ × 0.9^(5)

P(3) = 0.03306744

Repeating this same procedure, we have;

P(4) = 0.0045927

P(5) = 0.00040824

P(6) = 0.00002268

P(7) = 0.00000072

P(8) = 0.00000001

Thus;

P(X ≥ 3) = 0.03306744 + 0.0045927 + 0.00040824 + 0.00002268 + 0.00000072 + 0.00000001 = 0.03809179

Approximately 0.0381

Answer:

21

Step-by-step explanation:

Answer:

9/5 or 1.8

Step-by-step explanation:

25x(sqd)+81

x(sqd)=81/25

x=sq rt (81/25) = 9/5 =

BD bisect AC

Option B is the correct answer.

It is a two-dimensional figure which has three sides and the sum of the three angles is equal to 180 degrees.

We have,

From the figure,

FA is perpendicular to BC.

CFA is a right angle.

We see that BD bisects AC such that AD = CD.

Thus,

BD bisects AC

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Explanation:

We have 6 green out of 6+6+6 = 18 total

The probability of getting green is 6/18 = 1/3.

After selecting that green jelly bean and not putting it back, we have 6-1 = 5 green out of 18-1 = 17 total.

The probability of selecting another green is 5/17.

Multiply the two fractions 1/3 and 5/17

(1/3)*(5/17) = (1*5)/(3*17) = 5/51

The probability of selecting two greens in a row is 5/51 where we do not put the first selection back. We also do not replace the green jelly bean with some other identical copy.

Note: 5/51 = 0.098039 approximately

Answer:

The answer is your face try again loser

Step-by-step explanation:

Answer:

righ angle tringle

Step-by-step explanation:

because 90 degree angle is only in right angle tringle,we can not creat this angle in other tringle

Answer:

X= -4.66666667 or 5 when rounded to the nearest whole number.

Step-by-step explanation:

-4+5-7=10+3x-2

-11+5=8+3x

-6=8+3x

-6-8=8-8+3x

-14=3x

X= -4.66666667 or 5 when rounded to the nearest whole number.

Answer:

Step-by-step explanation:

We know that when two lines meet or intersect, we get a linear pair of angles.

Linear pairs are basically two adjacent angles that form a line.

The measure of two adjacent angles forming a straight line is 180, meaning they are supplementary.

We are given that <1 and <2 forms a linear pair, and

m∠1 = 4m∠2

It means the angle ∠1 is 4 times the measure of angle ∠2.

Let the angle ∠1 be = x

As the angle 1 is 4 times the measure of angle ∠2, so

The angle 2 will be = 4x

As <1 and <2 forms a linear pair, thus the measure of the sum of <1 and <2 will be 180°, so

x + 4x = 180

5x = 180

divide both sides by 5

5x/5 = 180/5

x = 36°

Therefore,

Answer:

28

Step-by-step explanation:

100 - 72 = 28

Answer:

4/9 are boys

Step-by-step explanation: