What is the area of a trapezoid with a base of 60 a height of 20 and a base of 30

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?

Explain how you do each step what term makes it inconsistent y=2x - 4 ?

What is the number 321,000,000 in scientific notation? also what is the number? ?