Please help and explain. Thanks! ALSO: There is a user on who always posts a link to nowhere under other users' questions. They say the answer is in the picture, but the link is not useable and I see them all over If you see that, please vote them 1 star because it's not helpful to others, and they are in it for the points.

Question attached:

Giuseppi's pizza had orders for $931.00 of pizzas. the prices were $21 for a large pizza, 514 for a medium pizza, and $7 for a small pizza. the number of large pizzas was two less than four times the number of medium pizzas. thenumber of small pizzas was three more than three times the number of medium pizzas. how many of each size of pizza were ordered?

For each proportion find the unknown number x 1/5/8=×/15

The graph of y = ax^2 + bx + c is a parabola that opens up and has a vertex at (0, 5). what is the solution set of the related equation 0 = ax%2 + bx + c?