I need help ASAP please

Can someone me my sister? she is in third grade. 50 points and brainlist! ones that are not answered. plz and thx!

9/10 divide by -3/15 as a mixed number

Revirite the formula to determine the area covered by one can of paint. alyssa and her father are going to paint the house this summer. they know they'll need 6 cans of paint. enter the correct answer. 000 done a formula that describes this scenario is (licierali 000 oo 6 w w = the total area of the walls p = area covered by a can of paint