Melanie was asked to find the slope of any line that will be perpendicular to the line "y = -2x + 4". Her response was the slope of any perpendicular line also has to be -2, since perpendicular lines has equal slopes. Is Melanie correct? If she is, explain why. If she is not correct, explain why not, and explain how to get the correct answer.

Tom had a total of $220 and he spent $35 on a basketball ticket . what percent of his money did he have left?

Afamily has five members. a mom, a dad, two sisters, & a brother. the family lines up single file. what is the probabillity that the mom is at the front of the line

Each person in an it department of 25 people works on at least one of 3 major projects: system security, program implementation, platform development. 10 people work on system security, 13 work on program implementation, and 12 work on platform development. 4 people work on system security and platform development, 5 people work on program implementation and platform development, and 2 people work on all three projects. how many people work on system security and program implementation?