Find the highest common factor of 42 and 90 thank you <3

What is the probability of rolling a single die greater than 4

Abank gives 6.5% interest per year. what is the growth factor b in this situation?

The brain volumes (cm cubed) of 50 brains vary from a low of 904 cm cubed to a high of 1488 cm cubed. use the range rule of thumb to estimate the standard deviation s and compare the result to the exact standard deviation of 175.5 cm cubed, assuming the estimate is accurate if it is within 15 cm cubed