Answer:
x=20
Step-by-step explanation:
form a ratio
28:7
4:1
x:5
x=20
Answer:
-75
Step-by-step explanation:
3(-30)=-90
-90+15 is -75
Answer:
90 liters
Step-by-step explanation:
It's given in the question!
Answer:
8/55
Step-by-step explanation:
4/5 DIVIDED 5 1/2 = 8/55
Answer:

Step-by-step explanation:
Given

Required
Determine the solution
Since b is a perfect square, the equation can be expressed as:

Apply difference of two squares:

Split:

Remove brackets:

Make a the subject in both equations

The solution can be represented as:
