Answer:
We have [ ( x + 7.4 ) ÷ 18 ] x 6 = 6;
Then, ( x + 7.4 ) ÷ 18 = 1;
x + 7.4 = 18;
x = 10.6;
Step-by-step explanation:
Answer:
We need to sample at least 37 weeks of data.
Step-by-step explanation:
We have that to find our level, that is the subtraction of 1 by the confidence interval divided by 2. So:
Now, we have to find z in the Ztable as such z has a pvalue of .
So it is z with a pvalue of , so
Now, find the margin of error M as such
We want 98% confidence that the sample mean is within $500 of the population mean, and the population standard deviation is known to be $1300
This is at least n weeks, in which n is found when
So
Rounding up
We need to sample at least 37 weeks of data.
Answer:
Step-by-step explanation:
What we know is that A + S = 111. That is, the miles Andre drove plus the miles Scott drove totalled 111 miles. What we also know is that Scott drove quite a bit more than Andre did. Scott drove 7 miles more that ( +7 ) 3 times the number of miles Andrea drove. That looks like this algebraically:
S = 3A + 7
Now we can sub in that value for S to the original equation:
If A + S = 111 and S = 3A + 7, then
A + 3A + 7 = 111 and
4A + 7 = 111 and
4A = 104 so
A = 26 and
S = 3(26) + 7 so
S = 85 miles.
Scott drove 85 miles.
3x-7y=2 ; 3x=2+7y x=2x+7y/3
If AB is parallel to CD, then A’B’ is parallel to C’D’.