Fill in the missing statements and reasons in the proof. (Points are high because I really need the answer)

Twice the sum of a number and 4 is equal to three times the difference of the number and 7. find the number.

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. how many hours after the truck's departure will the two meet?

Use a standard normal table to determine the probability. give your answer as a decimal to four decimal places. −1.5< < 1.5)