Question 28372
I need assistance on the following problem: Rod's quiz grades are 73, 75, 89, & 91. What scores on a fifth quiz will make his average quiz grade at least 85? Translate to an equality. I came up with:
X + 73 + 75 + 89 + 91 = greater then 85
NO NOT EQUAL TO 85 BUT 85*5=425..SINCE 85 IS AVERAGE SCORE TOTAL MARKS IN 5 TESTS IS 5*AVERAGE
X + 328 >=425  
X>=425-328=97 IS THE ANSWER 

greater then 85
???????????
X = 97