country a has a population of 8×10^5 people. country b has a population of 4×10^7 people. choose which country has a larger population. then fill in the blank with a number written in standard notation.

How many degrees does the hour hand move from 3: 00 to 5: 30?

Acar started driving from city a to city b, distance between which is 620 miles, at a rate of 60 mph. two hours later a truck left city b and started moving towards city a at a rate of 40 mph. what distance from city a is the point where the truck and the car will meet?

In the given triangle, ∠aed ∼ ∠ abc, ad = 6.9, ae = 7.2, de = 5.2, and bc = 10.2. find the measure of bd and ce. round your answer to the nearest tenth.