Answer:
x=-11, y=-5. (-11, -5).
Step-by-step explanation:
2y=2x+12
y=-2-3
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simplify 2y=2x+12 into y=x+6
y=-5
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-5=x+6
x=-5-6=-11
The given is f(x) = 620 · 7.8x
The standard equation for an exponential function is f(x) = Aoe^bx
where:
A is the initial amount
b is the growth factor which is constant
x is any real number
Therefore, the initial amount is 620 and the growth factor is 7.8
So I have the same problem with you
Answer:
a. 47
b. 87
c. 127
Step-by-step explanation:
Assume a total of 4 exams ( first 3 plus a final)
Let final score be X,
Hence, average score = (85 + 71 + 77 + x) / 4 = (233 + x) / 4
a) to get a C, the average score must be 70
70 = (233 + x) / 4
(233 + x) = 70 (4) = 280
x = 280 - 233 = 47 (Ans)
b) to get a B, the average score must be 80
80 = (233 + x) / 4
(233 + x) = 80 (4) = 320
x = 320 - 233 = 87 (Ans)
c) to get a A, the average score must be 90
90 = (233 + x) / 4
(233 + x) = 90 (4) = 360
x = 360 - 233 = 127 (Ans)