Parallelogram EFGH has consecutive angles that measure (x + 20)° and (3x)°. Find the value of x.

Prove that 3: 8 is equivalent to 12: 32.a. use diagrams to support your answer.

What is the distance between point a and b

The distribution of the amount of money spent by students for textbooks in a semester is approximately normal in shape with a mean of $235 and a standard deviation of $20. according to the standard deviation rule, how much did almost all (99.7%) of the students spend on textbooks in a semester?