We have such system of eq
First lets solve second eq
7x=21 /:7 divide both sides by 7
x=3
Now we can substitute it to first equation
9x-2y=19
9*3-2y=19
27-2y=19 /-27 subtract 27 both sides
-2y=-8 /:(-2) divide both sides by -2
y=4 - its the answer
what is the secret of life?? need only one Ans the 2nd Ans will be reported.
I assume she runs 2/3 of a mile is half an hour.
We can use a proportion to solve this problem.
Answer: In 3 hours, she would run 4 miles.
Answer: The jet's speed from A to B would be 5.5 km/hr.
Step-by-step explanation:
Since we have given that
Distance = 2500 meter
Outbound speed be x
Average speed be
Time = 9 hours 10 minutes =
According to question, it becomes,
Hence, the jet's speed from A to B would be 5.5 km/hr.
When using GeoGebra, I'm getting the regression curve to be roughly
h(t) = 1.67*(1.4)^t
I'm not sure how your teacher got 1.64 instead of the 1.67, but it's fairly close. So it seems like choice B is the best answer for the first part.
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Once we know the regression equation, we plug in t = 14 to find that,
h(t) = 1.64*(1.4)^t
h(14) = 1.64*(1.4)^(14)
h(14) = 182.236911939151
h(14) = 182.2
If 14 days have gone by, then we estimate the height is roughly 182.2 inches.
Compared to what the table says, which is 190 inches, we see that we have an underestimate. The error is about 190-182.2 = 7.8 which is under 10.
Answer: Choice C
The model <u>under-predicts</u> the actual height by <u>less than 10 inches</u>