7. Suppose you earned 7t - 1 dollars on Monday and 8t + 5 dollars on Tuesday. What were your total earnings? Simplify your answer.

a. - t + 4 dollars

b. - t - 6 dollars

c. 15t - 6 dollars

d. 15t + 4 dollars

earnings on monday - 7t - 1

earnings on tuesday - 8t + 5

total earnings = earnings on both monday and tuesday

we need to add the earnings on monday and tuesday

total earnings = 7t - 1 + 8t + 5

we bring the like terms together

= 7t + 8t - 1 + 5

since 7t and 8t are like terms we can add them and get 15t

-1 and + 5 have different signs so we have to find the difference of the 2 numbers which is 5 - 1 = 4 and the put the sign of the larger number (+5), positive sign

answer is = 15t + 4

answer is d. 15t + 4

D: if you combine the "t" numbers, (7 & 8) you get 15t. When you add 5 to - 1, your sum is 4 therefore the answer is D) 15t + 4