tell whether each percent of change is a percent of increase or a percent of decrease. then find each percent of change. original: 18 new: 9

An arithmetic series a consists of consecutive integers that are multiples of 4 what is the sum of the first 9 terms of this sequence if the first term is 0

Given that sin∅ = 1/4, 0 < ∅ < π/2, what is the exact value of cos∅? a. (√4)/4 b. (√15)/4 c. (4π)/2 d. (4√2)/4

Solve for x: 5/3 x = 20/21 it's fraction. remember to simplify your fraction