The starting cost for an appointment with an electrician is $50. The Electrical Company charges an additional fee of $20 per room inspected. Based on this information, what are the expected value and standard deviation of the total cost for an appointment with an electrician taking the additional fee into consideration

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) .

Acollection of coins has value of 64 cents. there are two more nickels than dimes and three times as many pennies as dimes in this collection. how many of each kind of coin are in the collection?

Ron has 8 caps and 4 of his caps are blue. thes rest of his cap are red. how many of ron's caps are red