54.45 the 5 in the tens place is blank the value of the 5 in the hundredths place

Two planes leave an airport at the same time, one flying east, the other flying west. the eastbound plane travels 20 mph slower. they are 1600 mi apart after 2 hr. find the speed of each plane.

Solve the equation x/4 - 5= -8 -27 -12 -7 12

Which of the following is the best first step in solving the equation below? 4+2㏒³x=17