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sladkih [1.3K]
3 years ago
7

Can some answer these math questions asap thanks

Mathematics
1 answer:
Alexus [3.1K]3 years ago
4 0

Answer:

3.) 63=3x+7y

4.) Y-intercept is 9

Step-by-step explanation:

(For 3) For every time a person gets a touchdown, x represents that

for every time a person person scored a successful extra-point attempt, y represents that.

And they team scores 63, so....

the equation would look like this

63=3x+7y

(For 4) You find the y-intercept by turning the standard form equatio  into the slop intercept form

(-3x)63=3x+7y (-3x)\\(\frac{1}{7}) 7y=(-3x+63)(\frac{1}{7} )\\y=-\frac{3x}{7} +9

(Helper's note, multiplying by its reciprocal is the same as dividing it by a whole number, in the case dividing the number by 7 is the save as multiplying the number by \frac{1}{7})

Then plugging x=0 and solve for y, which in this case, y=9

y=\frac{-3(0)}{7} +9\\y=9

(For the graphing) Turn 63=3x+7y into a slope intercept form, which is y=-\frac{3x}{7} +9 and graph from there

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The critical value is the z-score right at the edge of the rejection region option (A) is correct.

<h3>What is a normal distribution?</h3>

It's the probability curve of a continuous distribution that's most likely symmetric around the mean. On the Z curve, at Z=0, the chance is 50-50. A bell-shaped curve is another name for it.

It is given that:

The z-score is right at the edge of the rejection region.

As we know, the rejection zone is the area in which we have sufficient data to reject the null hypothesis if our test statistic falls within it.

Thus, the critical value is the z-score right at the edge of the rejection region option (A) is correct.

Learn more about the normal distribution here:

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8 0
2 years ago
Kiran wrote the expression x-10 for this number puzzle: "Pick a number, add -2, and multiply by 5."
ioda

Answer:

If you pick the number 2, you will get (2) - 10 = 8

But the way he said it, it would be:  (2) - 2 * 5 = 0

The correct way would be to write the expression:  (x - 3) * 5

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3 years ago
There are 3 marbles (yellow,blue and green). You pick a marble and flip a coin.
GuDViN [60]
1/3, bc you have 33.333% for each marble that it would be chosen.
8 0
4 years ago
Read 2 more answers
Three friends paid 26.25 to see a movie how much did each ticket cost
matrenka [14]
$8.75 is the answer.
You divide 26.25 by 3.
7 0
3 years ago
Function f is an exponential function. It predicts the value of a famous painting, in thousands of dollars, as a function of the
nalin [4]

Answer:

y=8 \cdot (\frac{5}{4})^x

f(x)=8 \cdot (\frac{5}{4})^x

or

f(x)=8 \cdot (1.25)^x

Step-by-step explanation:

We are going to see if the exponential curve is of the form:

y=a \cdot b^x, (b\neq 0).

If you are given the y-intercept, then a is easy to find.

It is just the y-coordinate of the y-intercept is your value for a.

(Why? The y-intercept happens when x=0. Replacing x with 0 gives y=a \cdot b^0=a \cdot 1=a. This says when x=0 \text{ that} y=a.)

So a=8.

So our function so far looks like this:

y=8 \cdot b^x

Now to find b we need another point. We have two more points. So we will find b using one of them and verify for our resulting equation works for the other.

Let's do this.

We are given (1,10) is a point on our curve.

So when x=1, y=10.

10=8 \cdot b^1

10=8 \cdot b

Divide both sides by 8:

\frac{10}{8}=b

Reduce the fraction:

\frac{5}{4}=b

So the equation if it works out for the other point given is:

y=8 \cdot (\frac{5}{4})^x

Let's try it.  So the last point given that we need to satisfy is (2,12.5).

This says when x=2, y=12.5.

Let's replace x with 2 and see what we get for y:

y=8 \cdot (\frac{5}{4})^2

y=8 \cdot \frac{25}{16}

y=\frac{8}{16} \cdot 25

y=\frac{1}{2} \cdot 25}

y=\frac{25}{2}

y=12.5

So we are good. We have found an equation satisfying all 3 points given.

The equation is y=8 \cdot (\frac{5}{4})^x.

4 0
3 years ago
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