Write an equation and solve
23% more than a number is 615
32% of a number is 256
15% less than a number is 493

What are the measures of ∠a, ∠b, ∠c and ∠d? explain how to find each of the angle measure.

The position of a moving particle is given by the position function: f(t)=-9t-t^2-0.2t^3+0.1t^4 a. at what time does the particle reverse direction? b. when is the displacement positive? (round one decimal place and answer in interval notation) c. when is the displacement negative? (round one decimal place and answer in interval notation) d. when is the particle’s acceleration positive? (round one decimal place and answer in interval notation) e. when is the particle’s acceleration negative? (round one decimal place and answer in interval notation)

How long does it take natsumi to clean up after she is done? table: .area time30. 245. 2.7560. 3.5