22.Ella earned scores of 72, 78, and 86 on the first three out of 4 long tests. What score must she earn in the last long test to have an average of at least 80?
A. x ≥ 85
B. x ≤ 85
C. x ≥ 84
D. x ≤ 84
Pa help po
A. x ≥ 85
B. x ≤ 85
C. x ≥ 84
D. x ≤ 84
Pa help po
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Answer:
d.84
Step-by-step explanation:
72+78+86=236
80x4=320
320-236=84
Answer:
95
Step-by-step explanation:
Explanation:
Required Average
=
80
Let the required grade be
x
.
Average
=
Sum of
n
numbers
n
So
80
=
76
+
84
+
65
+
x
4
320
=
225
+
x
x
=
320
−
225
x
=
95