How do I know if these ratios are equivalent?

If I buy something for $25.40 with 15% tax, what would it be?

Two angles are supplementary. One angle measures 2x, and the other angle measures 3x - 15. Which equation can you use to find the measure of each angle? a) 2x + 3x - 15 = 90° b) 2x - 3x - 15 = 180° c) 2x - 3x - 15 = 90° d) 2x + 3x - 15 = 180°

What is the answer to 3 (2n-7) + 7 (4-2n)

A plumber charges $52.50 per hour plus a $75 service charges. you father's firm hires him to fix leaky pipes. Find the total charge if it takes him 4.5 hours to complete the task?

If 200 vitamins cost $4.75 what should 500 vitamins cost

A square's side is increased by yards, which corresponds to an increase in the area by square yards. how many yards is the side of the initial square? the side is 5.92 yards.

If f (x) = 5x + 4, what is the inverse of f (x)

Marcie bought a jacket using the British currency pounds the jacket costs 45 pounds if 1.00$ = 1.64 pounds what was the cost in dollars

What is coterminal angle

Evaluate: 4 + 8: 2 * (6 - 3)