Question

B=1.69 (sqrt (s)+4.45)-3.49 solve for s

Answer 1

When evaluating an expression, you're always told to work your way from inside to outside, getting rid of parentheses as you go.

When solving for a variable, the process is reversed. you are trying to get from the outside to the inside. So, undo addition/subtraction, then multiplication/division:

B=1.69 (sqrt (s)+4.45)-3.49
add 3.49
B+3.49 = 1.69(sqrt(s)+4.45)
divide by 1.69
(B+3.49)/1.69 = sqrt(s)+4.45
subtract 4.45
(B+3.49)/1.69 - 4.45 = sqrt(s)
square both sides
((B+3.49)/1.69 - 4.45)² = s