Which equations illustrate the commutative property of multiplication?

choose exactly two answers that are correct.

a.
• 3.4 = 3.4 •

b.
–8 • (5 + 3.1) = (5 + 3.1) • (–8)

c.
–4 • (5 + 7.1) = –4 • 5 + (–4) • 7.1

d.
–8 • (4 • 1) = (–8 • 4) • 1

The base of a triangle exceeds the height by 7 centimeters. if the area is 400 square centimeters, find the length of the base and the height of the triangle.

Find an equation of the line perpendicular to the graph of 28x-7y=9 that passes through the point at (4,1)

Helll ! 1,400 tons of wheat of two different varieties was delivered to the silo. when processing one variety, there was 2% of waste and 3% during the processing of the second variety of wheat. after the processing, the amount of remaining wheat was 1,364 tons. how many tons of each variety of wheat was delivered to the silo?