Nora wants to find her average grade in her science class. she has earned a score of 85% on two tests, 92% on three tests, and 94% on her most recent test. what is nora’s mean, or average, test score?

Hence, Nora's mean or average score in all the test is:

90%

Step-by-step explanation:

It is given that:

Nora wants to find her average grade in her science class.

She has earned a score of 85% on two tests, 92% on three tests, and 94% on her most recent test.

That means she has given a total of 6 tests.

So, the mean score is calculated as ratio of sum of all the test to the total number of test she appeared in.

Hence, Mean is calculated as:

Hence, Nora's mean or average score in all the test is:

90%

step-by-step explanation:

the ratio of red paint to blue paint is always 9/7. that means that, whatever x's value, (4x+12)/(4x-4) has that same ratio. so, set up an equation and cross-multiply to solve for x:

9/7 = (4x+12)/(4x-4)

9(4x-4) = 7(4x+12)

36x - 36 = 28x + 84

8x - 36 = 84

8x = 120

x = 15