Idon't understnad this .
*d • r = r • d ? ?
a.)commutative property of multiplication
b.)identity property of multiplication
c.)zero property of multiplication
d.)commutative property of addition

Fanny mendelssohn manages all the magazines and paperback books at a local grocery store. she prices many paperbacks to sell at $7.99. the cost to the store is $5.29. what is the markup rate on a paperback book, based on its cost?

Daniel expanded the expression as shown below -2(-8x-4y+3/4)=-10x-8y-11/4 what errors did he make? check all that apply

Complete the solution of the equation. find the value of y when x equals to 28 x+3y=28