Your grades on 4 math tests are 79, 85, 86, and 88. You want your mean grade to
be at least 85. What grade on your fifth
test will give you a mean score of at least
85?

The grade on the fifth test that will give you a mean score of at least 85 is 87

Step-by-step explanation:

From the question, the grades on 4 math tests are 79,85,86, and 88.

To determine the grade on the fifth test that will give a mean score of at least 85,

Let the grade on the fifth test be x,

From the formula for mean

Mean = Sum of terms / Number of terms

That is,

85 = (79 + 85 + 86 + 88 + x) / 5

x = 87

Hence, the grade on the fifth test that will give you a mean score of at least 85 is 87.

hello :

70y^8 + 30y^6 = 2 ( 35 y^8 + 15y^6)

the lenght is : 35 y^8

the width is : 15y^6