At a school the number of boys : number of girls = 11 : 9.
There are 124 more boys than girls. Work out the total number of students at the school

1240

Step-by-step explanation:

the ratio is 11:9

let the number of girls be x, then the number of boys is x + 124

now

9x + 1116 = 11x

2x= 1116

x=558

so total number = x + (x+124) = 1240

3< x< 5

step-by-step explanation:

|x - 4| < 1

there are two solutions, one positive and one negative.   remember to flip the inequality when taking the negative solution

x-4 < 1       x-4 > -1

add 4 to each side

x-4+4 < 1+4       x-4+4 > -1+4

x< 5                 x> 3

3< x< 5

c.

step-by-step explanation:

she should of added 9^2 and 12^2. that is because it is a^2+b^2=c^2. c^2 is the hypotenuse and should always be bigger than the other two numbers. which is why she should of added 9 squared and 12 squared together instead of 15 squared.