Answer:
a=3
Step-by-step explanation:
This should be very simple, just substitute xy and y for 5 and 7 respectively, so 5a-2*7=1, or 5a-14=1, or 5a=15, if we divide both sides by 5, we get a=3
D the sample mean would less closely model the population mean
Answer:
The answer is B.
Step-by-step explanation:
You have to use area of trapezoid formula, A = 1/2×(a+b)×h where a, b are the side lengths and h is height :






The length is 14
Just count the spaces in between to get the result of 14