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DerKrebs [107]
3 years ago
14

What is 80 x 40? Make 5 paragraphs stating the answer.

Mathematics
1 answer:
MariettaO [177]3 years ago
7 0
80 x 40 is 320. I know 80 x 40 is 320 because 80 + 80 + 80 + 80 is 320. I also know 80 x 40 is 320 because 8 x 4 is 36. If you pretend the 0 is not there it’s 8 x 4. I know you can get the answer quicker that way because it’s just times tables.
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4 years ago
Write a rule for the nth term of the arithmetic sequence a8=-15 a17=-78
vivado [14]

Answer:

Find the 40th term for the arithmetic sequence in which

a8=60 and a12=48 .

Substitute 60 for a8 and 48 for a12 in the formula

an=a1+(n−1)d  to obtain a system of linear equations in terms of a1 and d .

a8=a1+(8−1)d→60=a1+7da12=a1+(12−1)d→48=a1+11d

Subtract the second equation from the first equation and solve for d .

12=−4d−3=d

Then 60=a1+7(−3) .  Solve for a .

60=a1−2181=a1

Now use the formula to find a40 .

a40=81+39(−3)=81−117=−36 .  

Step-by-step explanation:

4 0
2 years ago
Could someone help me with this please? We just started this today and don't understand it.
scoundrel [369]
The inequality is x < 1
5 0
4 years ago
What is the strongest relationship you can infer between two variables from this statement?
Dmitry [639]

Answer:

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3 0
3 years ago
A survey of 1050 eligible voters, an approximate 98% confidence interval estimate for the proportion of voters who claimed to ha
Novosadov [1.4K]

Answer:

There is a 98% confidence that the true proportion of voters who have voted in the last presidential election lies in this interval.

Step-by-step explanation:

The confidence interval for estimating the population proportion is:

CI=\hat p\pm z_{\alpha/2}\sqrt{\frac{\hat p(1-\hat p)}{n}}

The 98% confidence interval estimate for the proportion of voters who claimed to have voted in the last presidential election was (0.616, 0.681).

The sample taken was of size, <em>n</em> = 1050.

<u>Interpretation</u>:

The 98% confidence interval (0.616, 0.681) for the proportions of voters who claimed to have voted in the last presidential election implies that the true proportion of voters who have voted lies in this interval with 0.98 probability.

Or, there is a 98% confidence that the true proportion of voters who have voted in the last presidential election lies in this interval.

Or, if 100 such samples are taken and 100 such 98% confidence interval are made then 98 of these confidence intervals would consist of the true proportion of voters who have voted in the last presidential election.

8 0
3 years ago
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