All categories

3 years ago

I need a break down on how to do my home work step by step. Ex. (8)(-5)+(-7)(3)

1 answer:

5 0

Let's break this problem down and solve it step-by-step.

STEP-BY-STEP SOLUTION:

Keep in mind the following:

Two positives together or two negatives together = positive

One positive and one negative together = negative

Okay, now let's begin solving the problem.

= ( 8 ) ( - 5 ) + ( - 7 ) ( 3 )

First we will multiply the brackets together.

= ( - 40 ) + ( - 21 )

Next we will remove the brackets and change the positive ( + ) and negative ( - ) symbol into just a negative symbol, as a positive and negative always equals a negative as stated previously.

= - 40 - 21

Now we will simply subtract 21 from - 40 to achieve our final answer.

= - 61

Hope this helps! :)
Have a lovely day! <3

You might be interested in

given a is equal to 60 degree and 30 degree prove that sin a + b is equal to sin a cos b + cos a sin b

Feliz [49]

Answer:

A = 60 and B = 30

Now, A + B = 60 + 30 = 90

Also, A – B = 60 – 30 = 30

sin (A + B) = sin 90 = 1

sin A cos B + cos A sin B = sin 60 cos 30 + cos 60 sin 30

8 0

3 years ago

The J.R. Simplot Company produces frozen French fries that are then sold to customers such as McDonald's. The "prime" line of fr

Agata [3.3K]

Answer:

(5.871 `; 6.127)

Step-by-step explanation:

Given :

Mean = 6

Standard deviation. σ = 0.5

Samplr size, n = 100

Zcritical at 99% confidence = 2.58

The confidence interval :

Mean ± margin of error

Margin of Error = Zcritical * σ / sqrt(n)

Margin of Error = 2.58 * 0.5/sqrt(100) = 0.129

Confidence interval :

Lower boundary = 6.00 - 0.129 = 5.871

Upper boundary = 6.00 + 0.129 = 6.129

(5.871 `; 6.127)

3 0

3 years ago

The weight of adults Male beagles are normally distributed, with a mean of 25 pounds and a standard deviation of 4 pounds.

a_sh-v [17]

Answer:

There is a 95.6% chance that the weight will fall within this range.

Step-by-step explanation:

This is because the extremes that are given are roughly two standard deviations from the mean. To be outside of that, there is only 2.2% likelihood to be higher and another 2.2% to be lower. When we subtract these two from 100%, we get our probability.

100% - 2.2% - 2.2% = 95.6%

6 0

3 years ago

The sample mean is x = 12.8%. let x be a random variable that represents the percentage of wheat crop in that county lost to hai

katen-ka-za [31]

Given that $\bar{x}=12.8\%$ and $\sigma=5.0\%$ , given that the population mean is $\mu=11\%$ and the sample size is n = 16, the test statistic is given by

$z= \frac{\bar{x}-\mu}{\sigma/\sqrt{n}} \\ \\ = \frac{12.8-11}{5/\sqrt{16}} \\ \\ = \frac{1.8}{5/4} = \frac{1.8}{1.25} \\ \\ =1.44 \\ \\ \Rightarrow p-value=p(z\ \textgreater \ 1.44) \\ \\ =1-P(z\ \textless \ 1.44)=1-0.92507 \\ \\ =0.07493$

Since the test is a two tailed test, the p-value is 2(0.07493) = 0.14986

Since the p-value is greater the significant level of α = 0.01, thus, we fail to reject the null hypothesis and conclude that there is no sufficient evidence that <span>the percentage of wheat crop lost to hail in that county is different from the national mean of 11%</span>.

8 0

3 years ago

What’s the unit rate for 180 miles per 4 1/2 gallons

sasho [114]

Answer:

180 divided by 4.5 is 40 so the unit rate is 40 miles per gallon/ 40 over 1/ 40/1

Step-by-step explanation:

8 0

3 years ago

Read 2 more answers