2cos2θ-cosθ-1=0 for - 180°≤θ≤180°

I don't get how it is solved

The first six nonzero multiples of 3

Olive has read 79 pages on her book. Which equation shows how many more pages she has to read? t = Total number of pages r = How many more pages she has to read A. t + 79 = r B. r - 79 = t C. t - 79 = r

In a circle with a radius of 2158 yd, an arc is intercepted by a central angle of 5π/6 radians. What is the arc length? Use 3.14 for π and round your final answer to the nearest hundredth. Enter your answer as a decimal in the box.

Solve for z. 4z+12=28

Felicia invested money at an interest rate of 4%. After six months, she had earned $90.00 interest. How much money did Felicia invest?

Subtract the sum of - 11ab and - 23ab from the sum of - 19ab and 7ab

Which expression is equivalent to the given expression? 3 (2a + 5) ?

Suppose Eva has 12 3/4 pounds of flour. The day's baking will require that amount. How much flour will Eva need?

mary lee purchased a stove for $370 she made a down payment of $70 nas paid $49 a month for 18 months find the total installment price of the stove

A concession stand vendor counts the money in the register. after 2 h it has $82.75. after 6 h is has $ 360.75. how much money will be in the register at the end of an 8h shift? a. 480.00 b. 489.25 c. 499.75 d. 500.00