a system of equations is shown below:

equation a: 2c = d − 8
equation b: c = 3d + 8

which of the following steps should be performed to eliminate variable d first?

21 type the correct answer in the box. use numerals instead of words. if necessary, use / for the fraction bar. the solution set of n2 - 14n = -45 is { (separate the solutions with a comma)

Aparticular telephone number is used to receive both voice calls and fax messages. suppose that 25% of the incoming calls involve fax messages, and consider a sample of 25 incoming calls. (a) what is the expected number of calls among the 25 that involve a fax message?

Which number line correctly shows 0.8 + 0.3?