Please help I’ll mark you as brainliest if correct

Find the number of positive three-digit even integers whose digits are among 9, 8, 7,5, 3, and 1.

Find the magnitude, correct to two decimal places, made by each of the following with positive direction of the x axis a) y= x the answer is 45° but i don’t know how

Which of the following is missing in the explicit formula for the compound interest geometric sequence below?