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sattari [20]
3 years ago
10

HELP ASAP. please help the best answer gets brainliest

Mathematics
2 answers:
tatuchka [14]3 years ago
7 0
She should of crossed multipled
Aleonysh [2.5K]3 years ago
4 0

Answer:

She should have cross multiplied.

Step-by-step explanation:

-2.125, or 17/8, is the correct answer

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igor_vitrenko [27]

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How would I get this information into Y=Mx+B
andriy [413]
One question at a time, please.  I will focus on #16 and ignore #18.

slope:  3/4              line passes thru (-8,2)

Write out    y = mx + b.  Subst. 2 for y.  Subst. -8 for x  Subst. (3/4) for m:

2 = (3/4)(-8) + b.  Find b.           2 = -6 + b    =>           b = 8

So your equation is y = (3/4)x + 8.  Please, use (  ) around those fractions!
3 0
3 years ago
A different species of cockroach has weights that are approximately Normally distributed with a mean of 50 grams. After measurin
Ratling [72]

Answer:

The standard deviation of weight for this species of cockroaches is 4.62.

Step-by-step explanation:

Given : A different species of cockroach has weights that are approximately Normally distributed with a mean of 50 grams. After measuring the weights of many of these cockroaches, a lab assistant reports that 14% of the cockroaches weigh more than 55 grams.

To find : What is the approximate standard deviation of weight for this species of cockroaches?

Solution :

We have given,

Mean \mu=50

The sample mean x=55

A lab assistant reports that 14% of the cockroaches weigh more than 55 grams.

i.e. P(X>55)=14%=0.14

The total probability needs to sum up to 1,

P(X\leq 55)=1-P(X>55)

P(X\leq 55)=1-0.14

P(X\leq 55)=0.86

The z-score value of 0.86 using z-score table is z=1.08.

Applying z-score formula,

z=\frac{x-\mu}{\sigma}

Where, \sigma is standard deviation

Substitute the values,

z=\frac{x-\mu}{\sigma}

1.08=\frac{55-50}{\sigma}

1.08=\frac{5}{\sigma}

\sigma=\frac{5}{1.08}

\sigma=4.62

The standard deviation of weight for this species of cockroaches is 4.62.

4 0
3 years ago
In the following equations <br>solve for x<br>2(x - 1) = 16<br>(3×1) - (5=86) -10​
lara31 [8.8K]

Step-by-step explanation:

2(X-1)=16

2X-2=16

2X=16+2

X=18÷2

X=9

I don't understand (3×1)-(5=86)-10

I think it is wrong or sth I don't know!

6 0
3 years ago
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