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olasank [31]
3 years ago
5

If Anna's test grades are 66, 90, and 99, what is her test average?

Mathematics
2 answers:
marysya [2.9K]3 years ago
4 0

Answer:

90 because it is the mean

skad [1K]3 years ago
4 0

Answer: it’s 83%

Step-by-step explanation: you add them up and divide by 3

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15(d + 7) = 4(d - 4) + 11d has how many solutions?
svp [43]

15(d + 7) = 4(d - 4) + 11d\\\\15d+105=4d-16+11d\\\\15d-4d-11d=-16-105\\\\0=-121

no solution

4 0
4 years ago
Graph the equations to solve the system y=-x-2 y=2x+4
Nady [450]

Answer:

The solution is (-2, 0).

It is very easy to graph these two equations. You have the y-intercept for the first equation which is -2, and the slope -1/1. The y-intercept for the second equation is 4, and the slope is 2/1.

When you graph these two equations, you will see that they intersect at the point (-2,0); this is the answer.

6 0
4 years ago
10e-2e-9=39 solve variable. include steps, also check your answer!
mina [271]

Answer:

e = 6

Step-by-step explanation:

10e - 2e - 9 = 39

8e - 9 = 39

8e = 48

e = 6

CHECK:

10(6) - 2(6) - 9 = 39

60 - 12 - 9 = 39

39 = 39

6 0
4 years ago
Question 2
Elena-2011 [213]

Answer:

63 inches

Step-by-step explanation:

1 foot is 12 inches. 12×5 then add 3= 63

6 0
3 years ago
Read 2 more answers
Which expression can be used to find the surface area of the following triangular prism
Temka [501]

Answer:

It's BxHxL

Step-by-step explanation:

The base the hight and the length of the prisim

5 0
3 years ago
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