Simplify the expression by using a double-angle formula or a half-angle formula.

7cos^2 (theta/9) - 7sin^2 (theta/9)

sin (theta/6) cos (theta/6)

Draw a number line and show how to find the difference for 36-17 using the break apart method.

At a coin collector shop, a rare US coin was recently marked up 50% and is now selling for $210 how much was the coin before the mark up?

Reuben earns about $60 per week moving lawns in the summer and cleaning windows in the winter. He invested $220 in equipment. How long will it take him to earn $860? I need the answer

The drama club is selling tickets to the spring play. Adult tickets a cost $10 and youth tickets y cost $7.50. The drama club keeps 35% of each ticket sold. Write an expression to show how much the drama club makes on the spring play.

1 km 431 + 13 km 169m

The radius of Earth is 6,378.1 km, which is 18,983.9 km less than the radius of Uranus. Find the radius of Uranus.

Solve for x. s=3w+2x

Andre wants to save $40 to buy a gift for his dad. Andre's neighbor will pay him weekly to mow the lawn, but Andre always gives a $2 donation to the food bank in weeks when he earns money.

The sum of consecutive integers 1,2,3, ..., n is given by the formula 1/2n (n+1). How many consecutive integers, starting with 1, must be added to get the sum of 1081

Two lines that intersect to form right angles are called what? A. Skew lines B. Line segments C. Perpendicular lines D. Parallel lines