you are taking a science course in which there will be four tests, each worth 100 points. you have scores of 89, 97, and 95 on the first 3 teests. you must make a total of 360 in order to make an A. what scores on the last test will give you an A?
A: solution is {s|s > or = to 79}
To find out what scores you need on the last test to achieve an A, you can set up an equation:
(89 + 97 + 95 + x) / 4 = 360
In this equation, x represents the score you want to achieve on the last test.
To solve for x, you can start by multiplying both sides of the equation by 4 to get rid of the denominator:
89 + 97 + 95 + x = 360 * 4
Simplifying the equation:
89 + 97 + 95 + x = 1440
Now, combine the known scores:
281 + x = 1440
To isolate x, subtract 281 from both sides of the equation:
x = 1440 - 281
x = 1159
Therefore, to achieve an A, you will need to score 1159 or higher on the last test.