Since y=7x we can replace the y in the second equation with 7x
-5x+14x=9
x=1
Now plug in to get 7 for y, since 7x=y
Answer: x=1, y=7
When you multiply radical expressions you multiply the numbers under the radical symbols.<span><span>3–√</span>×<span>7–√</span>=<span>21<span>−−</span>√</span></span>
When you add radical expression you CANNOT add the numbers under the radical symbols.
<span><span>3–√</span>+<span>7–√</span>≠<span>10<span>−−</span><span>√</span></span></span>
Okay, So Y equals 0,
And C equals 1,
And D equals 2,
If you Input the numbers into the equation it is proved true, meaning my answers are correct. Hoped I Helped :)
Answer:
a)
b) 1.64
c) (16.57,19.85)
d) The sample size must be 135 or greater if the error must not exceed $1.00.
Step-by-step explanation:
We are given the following information in the question:
Sample size, n = 50
Sample mean = $18.21
population standard deviation = $5.92
a) Point estimate for the population mean cost
b) Margin of error =
Margin of error =
c) 95% Confidence interval
Putting the values, we get,
d) Marginal error less than $1.00
Thus, the sample size must be 135 or greater if the error must not exceed $1.00.