An expression is shown. 3x+6+5x−7x+4 which of the following are equivalent to the expression? choose all that are correct. a. 3(x+2)−7x+5x+4 b. 3(x+2)−2(x−2) c. 7x+4 d. x+10

Ascuba diver was 80 feet below sea level and swam up at a rate of 4 feet per minute. the two solutions show how long it took the scuba diver to reach an elevation of 20 feet below sea level. lydia and max used the methods shown below to find the time it took the diver to reach the new elevation.

Find the nonpermissible replacement for binthis expression.b2/5b +5

Having a hard time understanding this question (see attachment).