Davids scores on the first three of four 100-point math tests were 86, 92, and 89. what score does he need on his fourth math test to ensure an average score of at least 90?
a. x > 89
b. x > 93
c. x > 78
d. x > 90

Step-by-step explanation:

Davids scores on the first three of four 100-point math tests were 86, 92, and 89.

Let x be the score he need on his fourth math test.

Average of scores of four test is

It is given that average score of at least 90. It means average must be greater than 90.

Multiply 4 on both the sides.

Subtract 267 from both the sides.

Therefore the correct option is B.

step-by-step explanation:

answer: i realy don't get it that much can you me figer it out pleas you

step-by-step explanation: