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anonymous
 one year ago
URGENTTT
A student scored 84 and 87 on her first two quizzes. Write and solve a compound inequality to find the possible values for a third quiz score that would give her an average between 85 and 90, inclusive.
0.5<n<4.5
84<n<99
99<n<84
80<n<98
anonymous
 one year ago
URGENTTT A student scored 84 and 87 on her first two quizzes. Write and solve a compound inequality to find the possible values for a third quiz score that would give her an average between 85 and 90, inclusive. 0.5<n<4.5 84<n<99 99<n<84 80<n<98

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NotTim
 one year ago
Best ResponseYou've already chosen the best response.0Should give an explanation; I actually wanna know how to do this.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0The student already scored 84 and 87, so the average between the scores would be \[\frac{ 84 + 87 + n }{ 3 }\] and n is the third quiz score, so, the average must be between 0.5 and 4.5 inclusive The "inclusive" means less or equal than So \[85<\frac{ 84 + 87 + n }{ 3 }\le90\] If you multiply the entire inequality by 3 you get \[255<84+87+n \le 270\] and now you can sum up the 84+87 which is 171 now, you substract 171 to the entire inequality to leave x alove so \[255171<171+n171 \le 270171\] \[84<n \le 99\]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Correction: "the average must be between 80 and 90 inclusive"
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