Round 75.6475.6475, point, 64 to the nearest ten

Brent wants to know what is 5 x 1/2

Problem melissa is her dad build a walkway in their backyard. the walkway will be 54 feet long and 1.5 feet wide. the local hardware store sells tiles which are 1.5 by 1.5 feet and come in boxes of 12. how many boxes of tiles do they need?

Ab and bc form a right angle at point b. if a= (-3,-1) and b= (4,4) what is the equation of bc?