334,290,652 value of the first digit

Can someone me i’m confused. will give brainliest and a whole bunch of points

Explain how you can use the associative property to evaluate (7x50)x4.

One of the complementary angles is 4 degrees mor than the other. find the angles (recall that complementary angles are angles whose sum is 90 degrees.) which of the following can not be used to solve the problem if x represents one of the angles? a. 2x-4=90 b. 2x+4=90 c. x+4=90