What is the meaning of ratio and prportion

If (x-2) 2= 49, then x could be a. -9 b. -7 c.- 2 d. 5 e.9

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?

Multiply and simplify. 2x2y3z2 · 4xy4x2 how to do?