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ale4655 [162]
3 years ago
13

if 40% of the students in the class are boys , and if there are 18 girls in the class , then how many students are in the class?

Mathematics
1 answer:
chubhunter [2.5K]3 years ago
5 0
30

60% were girls so you put this as a ratio

60/100= 18/x

You calculate x to determine the total number which would equal 30.
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Tasya [4]

Answer:

.08

Step-by-step explanation:

4 0
3 years ago
The length of a rectangle is 2 feet less than twice the width. The area of the rectangle is 180 feet squared. Find the length an
Ksenya-84 [330]

Answer:

Width=10

Length=18

Step-by-step explanation:

The length is 2 feet less then twice the width

Let the width be x.

Then the length is 2x -2 based on the given information. Use this to make an equation since it is known that the area is 180feet squared.

x(2x-2)=180

2x^2 - 2x - 180 = 0

2( x^2 - x - 90) = 0

We now have a factorable quadratic.

2(x+9)(x-10)=0

So by zero product property, x=-9, x=10 Since a measure cannot be negative, -9 is an extraneous solution.

So x=10

Then the width is 10 and the length is 18

Hope this helps! Let me know if it is correct!

3 0
3 years ago
A craft show has an admission fee of $1.50 for children and $4.00 for adults. On Saturday 155 people came to the carnival and $5
rjkz [21]
X+y=155. Y= -x+155

1.50x +4(-x+155)= 520
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8 0
3 years ago
Descompuneti in factori. x^2+4x-5=?
Lapatulllka [165]
<span>Assume that,
   x^2+4x-5 = 0 .......(1)
       Then, x^2+4x-5 = 0 x^2+5x-1x-5 =0
   x(x+5)-1(x+5) = 0
    (x+5) (x-1) = 0
       We get x=-5 and x=1
       Sub x=-5 in equ (1)
   (-5)^2+4(5)-5 = 0
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    -25+25= 0
    0 = 0
       Sub x=1 in equ (1) (1)^2+4(1)-5 = 0
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3 0
3 years ago
PLEASE HELP ASAP
Vilka [71]

Answer:

A, 152 cm.

Step-by-step explanation:

A rectangular pyramid has a volume equation of

V = (lwh)/3.

Therefore, when we plug the values in:

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V = 455/3

V = 151.666667

V is approximately equal to 152 cm^3.

I hope this helped! :)

5 0
2 years ago
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