Find the missing number in the following sequence 21,3,42,_84,12

Two angles are supplementary. One angle is 5 * less than four times the other find the measures of the angles

Tell whether the sequence is arithmetic if it is identify the common difference - 9,-17,-26,-33

Which equation is correct? arccsc (x) = 1/cos (x) arccsc (x) = 1/sin (x) arccsc (x) = arccos (1/x) arccsc (x) = arcsin (1/x)

A triangle has a base of 17 inches and an area of 127.5 in.² what is the height of the triangle

60,000 pounds is how many tons

Aaron wants to buy 2 concert tickets that cost $25.50 each. Aaron's grandfather pays him $4.25 an hour to rake leaves. How many hours does Aaron have to rake leaves to earn the total cost of the tickets?

Writes the pair of fractions with a common denominator for 3/10 and 2/5

The volume of this cylinder is 6,430.72 cubic centimeters, the height is 8 cubic centimeters. What is the radius? Use ≈ 3.14 and round your answer to the nearest hundredth.

A meteorologist predicts a 20% chance of rainfall today. Which statement describes the likeihood of rainfall today?

Are a rational expression and its simplified forms equivalent? Provide mathematical examples to support your opinions.