Help please help me with these

13. a    14. a    15.b      16. sorry idk   17. sorry idk       9. a i think       11.b      12.a      7. true       8. either a or c, i think a

Step-by-step explanation:

this took a while hope this helps

● To do this, you need to multiply 6.75 by 21 to find out how many meters are in all. 6.75×21 is 141.75

● Next you multiply 141.75 by 2 to see how much it costs which is 283.5

● Since we're dealing with money, it would have two place values so we add a zero and we get $283.50