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I believe the answer is this.
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A.10(x)*3 *=multiplication
b.10(2)(3)=20(3)=60
Answer:
7
Step-by-step explanation:
Let x stand for the unknown number
(4+5)+3=(2+3)+x
First, solve the numbers in paratheses,
(4+5)+3=(2+3)+
9+3=5+x
Then combine like terms
12=5+x
Finally, subtract 5 from both sides
12-5=5-5+x
7=x, therefore 7 makes the statement true.
To calculate the minimum sample size needed to conduct a survey to verify the claim that 68% of young adults do not brush their teeth regularly.
The sample size for a proportion estimation is given by
where:
is the z-score of the confidence level and p is the proportion being tested.
Setting our confidence level to be 95%, then
= 1.96
Thus,
i.e. N <span>≥ 335.
</span>Setting our confidence level to be 90%, then
= 1.645
Thus,
i.e. N <span>≥ 236.
</span>
Setting our confidence level to be 99%, then
= 2.58
Thus,
i.e. N <span>≥ 335.</span>
Answer:
$1,344,300
Step-by-step explanation:
The difference on a yearly basis is ...
$80,000 -35,190 = $44,810
Over 30 years, that difference adds up to ...
$44,810 × 30 = $1,344,300