Evaluate cos? (67.5°) - sin' (67.5°)

A train goes from New Orleans to Boston at 40 mph. On the way back it returns with a speed 80 mph. If it takes it an hour less time to return, what is its average speed?

Consider the functions f (x) = 3x2 and g (x) = -2x-5. What is the value of f[g (-4) ]?

Eight quarts of oil cost $14.00. how much do 5 qt of oil cost

Jacob is cutting a tile in the shape of a parallelogram. Two opposite angles have measures of (6n - 70) ° and (2n + 10) °.

Fill in the gaps in the arithmetic sequence - 3, _,_, _, _, _ 12

Slingerland borrowed $8,000 on july 20, at 11% interest. if the loan was due on october 17, what was the amount of interest on the loan using the exact interest method?

One year the price of wheat was $8.87 the next year the price was $9.60 route is the price per bushel of wheat for each year to the nearest tenth of a dollar

F (x) = 71 (0.93) ^2x growth or decay

A lawn is in the shape of a right triangle with a perimeter of 215 feet. The lengths of the sides of the triangle are each multiplied by 7. What is the perimeter of the new triangle? A. 1505 ft. B. 6100 ft. C. 7120 ft. D. 8640 ft.

Given w (x) = 3x+8, find w (2b+6)