An experienced bricklayer can construct a small wall in 7 hours. An apprentice can complete the job in 42 hours. Find how long it takes if they work together

There is a line with slope 1/a going through the point (a, a²). find the equation of the line perpendicular to this line at this point. (don’t let this problem intimidate you! solve the problem as you would if i’d given you specific values. just use variables instead.)

Identify the number 127 as a rational or irrational. explain

Sam is picking fruit from a basket that contains many different kinds of fruit. which set of events is independent?