Problem 1: Your grades on your first three math tests were 81, 76, and 78. You have one more test to take. What grade do you need on that last test in order to get an 80
average?
Problem 2: You have $65 in your saving account, and your brother has $140 in his savings
account. You are depositing $15 per week to your account, and your brother is depositing
$10 per week to his account. In how many weeks will you and your brother have the same
amount of money?

51

step-by-step explanation:

73-22=51 the   mass number minus the amount of protons gives you the amount of neutrons

30 miles

step-by-step explanation:

we know that 60 seconds equals 1 minute and 60 minutes 1 hour

44 ft       60 sec     60 min     158400   ft

  *   *   =

1 sec       1 min       1 hour         hour

we know that there are 5280 ft per mile

158400   ft       1 mile         30 miles

  *   =

1   hour               5280 ft     1 hour

so in 1 hour   it can travel 30 miles

51840000 cm 2

step-by-step explanation: