On three science tests, Olivia has received scores of 89%, 98%, and 96%. What is the lowest score Olivia can get on her fourth and final science test to achieve an average score of 95%? a
94%
b
97%
c
96%
d
95%

97%

Step-by-step explanation:

Average = x1 + x2 + x3 + x4 + x5 + xN

                                          N

N = total numbers

=> (89 + 98 + 96 + x) / 4 = 95

=> (283 + x) /4 = 95

=> (283+ x) / 4 * 4 = 95 * 4

=> 283 + x = 380

=> 283 -283 + x = 380 - 283

=> x = 97

I divided the sum of all numbers by 4 we are adding 4 numbers.

So, she needs to get 97% in the last test in order to have an average score of 95%

y = - 6

step-by-step explanation:

given the point (- 2, y) lies on the graph then it is a solution of it's equation.

substitute x = - 2 into the equation for value of y

y = 3(- 2) = 3 × - 2 = - 6

the point on the graph is (- 2, 6)

step-by-step explanation:

ask goog great chance of finding the solution there