Answered

  1. Find the volume of a sphere with radius 9.25 cm. Use 3.14 as an approximation for pi. Round the answer to two decimal places.
A3313.55 cm3
B358.4 cm3
C1864.82 cm3
D114.08 cm3





  1. Evaluate: -16 minus w, when w = -23.
A7
B-39
C-7
D39




  1. If ∠A and ∠B are complementary angles, and ∠A = 27°, find ∠B.
A63°
B65°
C70°
D73°





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Verified Answer :

LightningEmerald1
  1. The formula for finding the volume of a sphere is 4/3πr^3
    The problem says the radius is 9.25 cm.
    Just plug in the numbers and solve:
    4/3(3.14)(9.25^3)
    9.25^3 = ~791.45
    4/3(3.14)(791.45)
    4/3 • 3.14 = ~4.19
    4.19 • 791.45 = 3316.1755
    It says to round to 2 decimal places so the answer to this question would be 3316.18.
    That means 3316.18 is the volume of the sphere.

    20. It's always best to change words into an equation.
    -16 - w
    w = -23
    Plug in the number to the variable:
    -16 - (-23)
    Double negatives (a negative being subtracted) turn into a plus (positive being added).
    -16 + 23 = 7
    So the answer is 7.

    25. Complementary angles are angles with a sum of 90º.
    If angle A is 27º, just subtract that from 90º to get the measure of angle B.
    90 - 27 = 63
    So angle B is 63º, and the answer is A.

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