Solve the compound inequality: 13 < 4x - 7 < 25

Step-by-step explanation:

This is just like an equation or compound equation, the only difference is that when multiplying or dividing by a negative #, to flip the inequality signs. You can either solve this equation by breaking it into to equations:

13 < 4x -7

and

4x-7 < 25

And then put it together...

... Or you can solve it as a whole. I am going to solve it as a whole

13 < 4x-7 < 25                 Given

13+7 < 4x-7+7 < 25+7     Addition Property of Inequality (Add 7 to all sides)

20 < 4x < 32                   What's left

20/4 < 4x/4 < 32/4         Division Property of Inequality (Divide by 4 on all sides)

5 < x < 8                          Answer

Therefore x must be 6 or 7.

24

step-by-step explanation:

the graph shows 30% of students walk. 80 students were questioned, so the number that said they walk is

30% × 80 = 0.30 × 80 = 24