The number of members f(x) in Joe's health club increased by 25% every year over a period of x years. The function below shows t

Answer: 30%

Step-by-step explanation:

Calculate the difference between the original price and the discounted price.

21.50 - 15.05 = 6.45

Now, divide the amount saved by the original cost.

6.45/21.50 =.3

Then, multiply the result by 100

.3 * 100 = 30

x1-2x2-x3= -2Step-by-step explanation:Substituting the three points yields three equations:a1+0a2+ 3a3=d --------------eq ia1+a2+a3=d----------------eq ii-2a1-a2+2a3=d---------------eq iiiNext, subtract eq i from eq iia2-2a3=0 ----------- eq ivNow combine eq iv with eq iii-2a1=d ------- eq vInsert eq v back into eq ia1 + 3a3=-2a1This gives a3=  -a1 ----------- eq viReplace eq vi in eq iva2-2(-a1)=0This simplifies to a2= -2a1 ------ eq viiNow insert eq v, eq vi, and eq vii into the plane equationa1x1+ a2x2+a3x3=dThus yielding a1x1 -2a1x2-a1x3=-2a1x1-2x2-x3= -2.

Answer:

Option B.

Step-by-step explanation:

As known,

Margin of error = Z * standard error

The margin of error can only be reduced by lowering either the Z value or the standard error, as both are directly proportional to the margin of error.

The Z-value can be diminished by utilizing lower confidence intervals. Standard error can be minimized by augmenting the sample size (as indicated in option B)

The correct choice is option B because it involves a sample size of 50 instead of 35, which subsequently lowers the standard error and consequently the margin of error.