Find the surface area of a sphere with a diameter 18 cm. round your answer to the nearest hundredth. a. 768 sq. cm b. 1017 sq. cm c. 798 sq. cm d. 1987 sq. cm

1017.88 cm²

Step-by-step explanation:

The surface area of a sphere is given by ...

... A = πd²

... ≈ 3.141593×(18 cm)² ≈ 1017.88 cm²

Comment on the answer choices

The problem says to "round your answer to the nearest hundredth", yet none of the answer choices show any hundredths. Thus according to the problem statement, none of the choices is correct.

1017 is only a viable choice if you use 3.14 for π. When the answer has 4 significant digits (and is supposed to have 6 significant digits), you know it is in error if you only use a 3-digit value for pi. Even the "right" answer is wrong.

72 is the answer to this problem

in simplified version   it would be x ≤-4

step-by-step explanation:

multiply each term in x ≤-4 by -1