The first step to solve a quadratic expression that's not set to zero is to solve the equation so that it is set to zero:

b² - b - 38 = b - 3
b² - b - 38 + 3 = b
b² - b - b - 35 = 0
b² - 2b - 35 = 0

Next, factor the quadratic equation:

b² - 2b - 35 = 0
(b + 5)(b - 7) = 0

For this expression to be true, the left side of the expression must equal zero. Therefore, either (b + 5) or (b - 7) must equal zero:

If (b + 5) = 0, b must equal -5
If (b - 7) = 0, b must equal 7

So the solution is that b = -5 or 7

The circumference of a circle is the distance around its perimeter and equals π (approx. 3.14159) x diameter: c = π d. The area of a circle is π x (radius)² : a = π r².

The surface area of a cylinder is 2πr² + 2πrh:

sa = 2πr² + 2πrh
sa = 2π(5²) + 2π(5 x 7)
sa = 2π(25) + 2π(35)
sa = (2 x 25)π + (2 x 35)π
sa = 50π + 70π
sa = 120π

An acute angle measures less than 90°, a right angle measures 90°, and an obtuse angle measures more than 90°.

The volume of a cylinder is πr²h:

v = πr²h
v = π(6² x 6)
v = 216π