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AfilCa [17]
3 years ago
11

In a class there are 40 students 30 are boys and what is the percentage of girls ....​

Mathematics
1 answer:
Artyom0805 [142]3 years ago
6 0

Answer:

25%

Step-by-step explanation:

Total= 40 students

boys +girls= 40

30 +girls= 40

number of girls

= 40 -30

= 10

Percentage of girls

=  \frac{10}{40}  \times 100\% \\ =  25\%

Alternatively,

percentage of girls

= 100% -(percentage of boys)

= 100\% - ( \frac{30}{40}  \times 100\%) \\  = 100\% - 75\% \\  = 25\%

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A line passes through the point (–7, 5) and has a slope of 1/2. Which is another point that the line passes through?
Andrej [43]
The answer to this question is (9,13). Here's how:
First thing you need to do is find the equation. You have a coordinate point and the slope. Remember a linear equation or formula is y=mx+b (m= slope and b= y-intercept)

So let's input the slope into the equation:
y=1/2x+b or y=0.5x+b
Notice how there is no b yet? That's because you need to find it. Good thing you have the coordinate points, so replace x and y with it. ( (x,y) = ( -7, 5) )

5=0.5(-7)+b
5= -3.5+b
+3.5 +3.5
b= 8.5
The equation is now y=0.5x+8.5 and with that equation you can now input it in a calculator to find which of the following coordinate points lies on. Or you can just input those points into the calculator. Which I did because I love to show my work. I have a picture of the work included and I really do hope I helped you. If not, message me. I'll be glad you to help you!

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3 years ago
During a school food drive, the
Dafna11 [192]
428 = c + 62 I think this is right I’m not so confident
8 0
3 years ago
PLEASE HELP!!! Pr-Cal Question 20 points
Brilliant_brown [7]

Answer:

3600

Step-by-step explanation:

perimeter is  120ft

Goal is to get the largest area.

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1*119 = 119ft

2*118 = 236ft

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7 0
3 years ago
Read 2 more answers
Which situation cannot be represented by the equation 8−x=3?
lubasha [3.4K]

Answer:

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Step-by-step explanation:

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3 years ago
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The sum of three numbers is 3. if the second number is subtracted from the sum of the first and third numbers, the result is 9.
Margaret [11]
Let the three numbers be x, y, and z.

If the sum of the three numbers is 3, then x+y+z=3

If subtracting the second number from the sum of the first and third numbers gives 9, then x+z-y=9

If subtracting the third number from the sum of the first and second numbers gives -5, then x+y-z=-5

This forms the system of equations:
[1] x+y+z=3
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First, to find y, let's take do [1]-[2]:
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Then, to find z, let's do [1]-[3]:
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Now that you have y and z, plug them into [1] to find x:
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x=2

So the three numbers are 2,-3, and 4.


5 0
3 years ago
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