Aprepaid cell phone charges a preset number of minutes to use text messaging. the graph represents y, the number of minutes used for x, the number of text messages sent and received. is there a direct variation? which equation represents the relationship?

Find the value of x for which abcd must be a parallelogram -9-6x x-30

If 10 men take 18 days to mow 60 acres of grass, how long will 15 men take to mow 80 acres?

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?