PLEASE HELP 10 POINTS + BRAINLIEST

A freight train averages 40 mi/h traveling to its destination with full cars and 50 mi/hr on the return trip with empty cars. What is the train’s average speed for the entire trip? Round to the nearest tenth.

Please show work

45 mph

Step-by-step explanation:

40 + 50 = 90

90 / 2 = 45

the largest number of the four options is 1.8 x 10-2

you have it in scientific notation.

1.80 x 10-6   = 0.00000180

1.80 x 10-4   = 0.000180 (bigger, or "less small", than the former one)

so

1.8 x 10-2       = 0.0180. as you see. the "less small", or the biggest one of them all.

as you have negative exponent, it means you are dividing 1.8 by 100 (i.e. moving the dot towards left, two times).

if you had positive exponent for the scientific notation, power of tenths, you would be multiplying times 100 (moving the dot towards right) as below:

1.8 x (10)2 = 180

so. if you have negative exponent in scientific notation, move the dot toward left. if it is positive, toward right as many times the exponent tells you.

20%

step-by-step explanation: