] x^{4}-4 x^{3} -21-16 x^{2} ÷
Answer:
651 is the minimum number of people over age 30 they must include in their sample.
Step-by-step explanation:
We are given the following information:
Confidence level = 90%
Significance level = 10%
Maximum error = 0.09
Variance = 1.96
Formula:
Putting all the values,
651 is the minimum number of people over age 30 they must include in their sample.
Answer:
x=6
Step-by-step explanation:
AB=BC
3x+3=2x+9
x=6
Answer:
D
Step-by-step explanation: