Alexandra has 36 coins valued at $6.00. she has only nickels and quarters. which equation can be used to solve for the number of nickels, n? a.0.05n + 0.25(36 – n) = 6 b.0.05n + 0.25(36 – n) = 36 c. n + 0.05 = 0.05n d. n + (36 – n) = 36

Anyone know? will mark brainliest if you're correct!

Mary beth used the mapping rule to find the coordinates of a point that had been rotated 90° counterclockwise around the origin. examine the steps to determine whether she made an error. m (3, –6) is rotated 90° counterclockwise. (x, y) → (–y, x) 1. switch the x- and y-coordinates: (6, –3) 2. multiply the new x-coordinate by –1: (6(–1), –3) 3. simplify: (–6, –3) .

Scrub a dub toothbrushes are $4.00 each. there is a 10% discount, but there is also a 6% sales tax after the discount is applied. what is the new price after tax? round to the nearest penny