What is the best first step in solving the formula for b

see explanation

Step-by-step explanation:

given

c =

The first step is to square both sides, giving ← best first step

c² = ()², that is

c² = a² + b² ( subtract a² from both sides )

c² - a² = b² ← take the square root of both sides

b =

d) -1

step-by-step explanation:

answer: the 4 kilogram bag

step-by-step explanation: this is because if you divide the number of kilograms into the total it will tell you how much each individual kilogram would be worth. 2 kilos is 7 and change 3 would be around 6 ish and the 4 kilo would be 4.6 and change and the 5 kilos would be like 4.88