Which equation is not an identity?

tan (-t) = - tan t

tan t (csc t + cot t) = sec t + 1

sin tcot t = cos t

cos2t - sin2t = - 1

Ava's mother is 3 times as old as Ava. Her grandmother is twice as old as Ava's mother. The sum of their three ages is 120. How old is Ava's mother?

suppose that y varies directly with x and y = 9 when x = 18 write the direct variation that relates to X and Y. y = and find y when x=5

Use the unit rate and the amount of water pumped after 12 minutes to find how much water will have been pumped into the pool after 13 1/2 minutes explain your reasoning

Let d = 3. What is the value of 5 · 6 + d · 2? 180 66 90 36

Eight more than the product of a number and 9 is 6 translate this into an equation

The diameter of a circle is 8 kilometers. What is the angle measure of an arc kilometers long?

a beach is 7.3 miles wide and 30 miles long. If one inch of rain falls on this beach, how many cubic feet of rain fell in this area?

2 employees share 1 job. A girl works Monday Wednesday and Fridays. A boy works Tuesdays and Thursdays. The job pays an annual salary of $28,602. What annual salary does each employee earn?

A cyclist rides her bike at a speed of 10 miles per hour. What is this speed in kilometers per hour? How many kilometers will the cyclist travel in 2 hours? In your computations, assume that 1 mile is equal to 1.6 kilometers.

X^3+10x^2+16x factored