A science class has 3 girls and 7 boys in seventh grade. The teacher randomly selects a seventh grader and an eighth grader from class for a competition. What is the probability that the students she selects are both girls? Write your answer as a fraction in simplest form.

If 3x+8=3x+8 is it one solution or no solution

The u-drive rent-a-truck company plans to spend $13 million on 320 new vehicles. each commercial van will cost $25 comma 000, each small truck $50 comma 000, and each large truck  $80 comma 000. past experience shows that they need twice as many vans as small trucks. how many of each type of vehicle can they buy?

What is the solution to this system of equations? y= 2x - 3.5 x - 2y = -14