3 years ago

Solve the system by the elimination method.

Mathematics

1 answer:

REY [17]3 years ago

8 0

Answer: C is correct, 4x=8

Step-by-step explanation:

You will add the two equations...

4x-8=0

Now you need to move the -8 over, which reverses its sign to positive.

4x=8

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A random sample of 10 chocolate energy bars of a certain brand has, on average, 230 calories per bar, with a standard deviation

Troyanec [42]

Answer:

The confidence interval for the true mean calorie content is

$215$

Step-by-step explanation:

In this problem we know the mean and standard deviation fo the sample, so we can compute the CI like this:

$\bar{x}-t*s/\sqrt{n}< \mu$

We need to determine t for 10-1=9 degrees of freedom and 99% confidence level. We look up in the t-table and the value for t is 3.2498.

Then we can calculate the limits of the CI:

$\bar{x}-t*s/\sqrt{n}< \mu$

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4 years ago

Express as a trinomial: (2x+10)(x-9)

Alborosie

(2x + 10)(x - 9)
2x(x - 9) + 10(x - 9)
2x(x) - 2x(9) + 10(x) - 10(9)
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3 years ago

Does anyone one know how you do this like the formula for this? Since its integers and I’m having a hard time understanding it

Leto [7]

Answer:

you just have to multiply and subtract or divide and give you the answer

Step-by-step explanation:

i you wan i can do them for you

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3 years ago

Helppp me plzzzzz am begging

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OK you’re gonna have to show me chart little Mr. CH

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