Raul has driven 520 miles in two days. at the same rate, how long would it take him to drive 1,560 miles?

With #! i’ve tried to figure it out but i can’t.

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

What is the measure of angle x? answer