Question 1125512
on the first two psychology tests, a girl had scores of 79 and 83. she wants her average to be at least 87.
 what score does she need on the third test?
;
let x = score required to have an 87 average

{{{((79 + 83 + x))/3}}} = 87 
162 + x = 3(87)
x = 261 - 162
x = 99 is required on the 3rd test