The solution to the equation would be 21.5

Why?

If you do the equation backwards

30 - 8.5 = x

You would get 21.5
You can plug it into the first equation to check!

:)

8 0

3 years ago

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Grace bought a book for $8 and some pencils that cost $.50 each. She spent a total of $18. Write and solve an equation to determ

ladessa [460]

18$-8$book=20pencils that were 10$.

and Brian had 80 cards work: 80÷2= 40+10 new cards=50 cards

8 0

2 years ago

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Joey scored 697 points by collecting 17 coins. In all, how many coins does Joey have to collect to score a total of 820 points?

Oksi-84 [34.3K]

Answer:

20 coins

Step-by-step explanation:

697/17 = 41

820/41 = 20 coins

7 0

2 years ago

Determine

Luden [163]

Answer:

$\mu_{x} = 64, \sigma_{x} = 12.83$

Step-by-step explanation:

The Central Limit Theorem estabilishes that, for a random variable X, with mean $\mu$ and standard deviation $\sigma$ , the sample means with size n of at least 30 can be approximated to a normal distribution with mean $\mu_{x} = \mu$ and standard deviation $\sigma_{x} = \frac{\sigma}{\sqrt{n}}$

In this problem, we have that:

$\mu = 64, \sigma = 77, n = 36$

$\mu_{x} = 64, \sigma_{x} = \frac{77}{\sqrt{36}} = 12.83$

7 0

3 years ago