Ineed with these two problems. need an explanation, steps, and an answer.

Let be the scores of the first 8 quizzes. We know that the average of these scores is 85, so we have

The average of the first 9 scores is 81, and it is given by

But we know that the sum of the first 8 is 680:

And we can solve for the nineth score: multiply both sides by 9:

Subtract 680 from both sides:

450

step-by-step explanation:

you get texts and minutes, so why not

1 1/7 hope i

step-by-step explanation:

8/7 = (1 * 7 + 1) / 7 = 1 + 1/7 = 1 1/7