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8. C=131.88 mm

9. C=40.82 ft

10. A=254.34 in²

Step-by-step explanation:

8. diameter of 42 millimeters- circumference?

Radius is half of 42, so 21 mm

Circumference=2πr

C=2π21

C=131.88 mm

9. diameter of 13 ft- circumference?

radius is half of 13, so 6.5

Circumference=2πr

C=2π6.5

C=40.82 ft

10. radius of 9 in- area?

Area=πr²

A=π9²

A=π81

A=254.34 in²

The domain of f(x) = 8x^2 - 5x + 2 is all real numbers.
For the range, f(x) = 8x^2 - 5x + 2 written in vertex form is f(x) = 8(x^2 - 5/8x + 1/4) = 8(x^2 - 5/8 + 25/256 + 1/4 - 25/256) = 8(x - 5/16)^2 + 8(39/256) = 8(x - 5/16)^2 + 39/32
The range is all real numbers greater than or equal to 39/32