Sam will take four science tests this quarter. Her scores on three of the tests are shown below Test 1: 83%

Test 2: 91%

Test 3: 88%

Test 4: ?

What does Sam need to score on the fourth test to ensure that she will have an average of 90% for all four tests

answer: about 22.67

step-by-step explanation:

step-by-step explanation: given equation a = h(b 1+b 2)

also we are given values of a, h and b 1 as :

a = 16, h = 4, and b 1 = 3.

in order to solve it for b 2, we need to plug the given values of   a, h and b 1 .

therefore, plugging values of   a, h and b 1   in given equation, we get

16 = 4( 3 + b 2)

first dividing both sides by 4, we get

4 = 3 + b 2

subtracting 3 from both sides, we get

4 -3 = 3 -3 + b 2

1 = b 2.