The lines 5x+2y=14 and y=-5x+9 are? A: Parallel
B: Perpendicular
C: Neither
Please Help lol

For what values of the variable x is the expression square root of 7x+14+ square root of 7-x a real number?

Find the quotient with the restriction.

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?