I do not understand this question, anyone help? Most brainiest for the right answer!

Mathematics

1 answer:

Oksi-84 [34.3K]3 years ago

6 0

Answer:

56.7

Step-by-step explanation:

We know

mean = sum / count, with count being the amount of papers corrected in this case. We want to find the sum of all the papers as well as the count to figure out the mean of all papers.

For Tony's papers,

mean = sum / count

50 = sum / 40

multiply both sides by 40 to isolate the sum

sum = 50 * 40 = 2000

For Alice's papers,

mean = sum / count

70 = sum / 20

multiply both sides by 20 to isolate the sum

70 * 20 = sum = 1400

The total sum of all 60 papers is equal to the sum of 40 papers + the sum of the remaining 20 papers, or 2000 + 1400 = 3400. The mean of the 60 papers is therefore

mean = sum / count

mean = 3400/60 ≈ 56.7

You might be interested in

Select the correct difference.<br> -3z^7- (-5z^7)

Rom4ik [11]

2z^7 the first choice

3 0

3 years ago

Read 2 more answers

Write into a single logarithm log b (X+1)+ log b (X-8)

ElenaW [278]

To solve, use properties of logs, specifically log(u)+log(v)=log(uv). This makes your equation logb(x+1)+logb(x-8)=logb((x+1)(x-8)), which can be made into logb(x^2-7x-8) by expanding the factored form.

3 0

3 years ago

Jill invest $400 in a savings bond. The value of the bond V(x) in hundreds of dollars after x years is illustrated in the table

tankabanditka [31]

Answer:

V(x) = 4(1.35)x, and it grows.

Step-by-step explanation: