Atechnician can complete an installation in 1.5 hours. her less experienced colleague takes 2.5 hours to complete an installation. if both individuals start working at the same time, and each works 60 hours over the course of ten days, how many total installations will they have completed?

Solve the system of equations. y= 2x y= x^2 - 15

International calls require the use of a country code. many country codes a 3-digit numbers. country codes do not begin with a 0 or 1. there are no restrictions on the second and third digits. how many different 3-digit country codes are possible?

Use the frequency distribution, which shows the number of american voters (in millions) according to age, to find the probability that a voter chosen at random is in the 18 to 20 years old age range. ages frequency 18 to 20 5.9 21 to 24 7.7 25 to 34 20.4 35 to 44 25.1 45 to 64 54.4 65 and over 27.7 the probability that a voter chosen at random is in the 18 to 20 years old age range is nothing. (round to three decimal places as needed.)