I have to find the value of x please help me will give brainliest to correct answer​

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?

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

The lines shown below are parallel. if the green line has a slope of -1, what is the slope of the red line?