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3 years ago

I need this one solved Chief.

Mathematics

1 answer:

nikdorinn [45]3 years ago

4 0

X is equal to 8
Y is equal to 0

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7x-3=18 What is x in the question i cbat figure it out

il63 [147K]

7x-3 = 18
+3 for both sides

7x = 21
devide 7 for both sides

x = 3

3 0

2 years ago

Select the correct answer. Which function is the inverse of ?

Artyom0805 [142]

Answer:

B. $f^{-1}(x) = \frac{x + 3}{9}$

Step-by-step explanation:

$let \space\ y = f(x)\\\\y = 9x -3\\$

• Now make x the subject of the equation:

$9x = y + 3\\\\x = \frac{y + 3}{9} \\$

• Replace x with f⁻¹(x) and y with x:

$f^{-1}(x) = \frac{x + 3}{9}$

6 0

2 years ago

Read 2 more answers

The National Center for Educational Statistics surveyed 5400 college graduates about the lengths of time required to earn their

fenix001 [56]

Answer:

The 90% confidence interval for the mean time required by all college graduates is between 5.36 years and 5.44 years.

Step-by-step explanation:

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

$\alpha = \frac{1-0.9}{2} = 0.05$

Now, we have to find z in the Ztable as such z has a pvalue of $1-\alpha$ .

So it is z with a pvalue of $1-0.05 = 0.95$ , so $z = 1.645$

Now, find the margin of error M as such

$M = z*\frac{\sigma}{\sqrt{n}}$

In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

$M = 1.645*\frac{1.9}{\sqrt{4500}} = 0.04$

The lower end of the interval is the sample mean subtracted by M. So it is 5.4 - 0.04 = 5.36 years.

The upper end of the interval is the sample mean added to M. So it is 5.4 + 0.04 = 5.44 years.

The 90% confidence interval for the mean time required by all college graduates is between 5.36 years and 5.44 years.

3 0

3 years ago

Find the distance from point A to the given line A(2,-1), y=-x+4

BARSIC [14]

Answer:

using distance formula you can solve it

8 0

2 years ago

Apa-bear weighs 250 lb. Mama-bear weighs 50 pounds less than Papa-bear does. Their 2 cubs weigh 80 pounds each. What is the tota

o-na [289]

Given :

Apa-bear weighs 250 lb.

Mama-bear weighs 50 pounds less than Papa-bear does.

Their 2 cubs weigh 80 pounds each.

To Find :

The total weight of the Bear family .

Solution :

Weight of mama bear = $250-50\ lb=200\ lb$ .

Total weight is the sum of all all weight .

$W=\text{Weight of papa-bear + weight of mama-bear + weight of 2 cubs}$

$W=250+200+2\times 80\\\\W=250+200+160\\\\W=610 \ lb$

Therefore , total weight of the Bear family is 610 lb .

Hence , this is the required solution .

5 0

3 years ago