All categories

3 years ago

The square of a number is 15 more than 2 times the number

Mathematics

1 answer:

UkoKoshka [18]3 years ago

3 0

x^2 = 2x + 15

x^2 -2x - 15 = 0

Factor:

(x-5)(x+3) = 0

x = 5 or x = -3

You might be interested in

Does anybody know the area for this question

allochka39001 [22]

I think it's 10 because the perimeter is 30 and I divided the 30 by 3 because there's 3 rectangles and the answer I got is 10. Not 100% accurate but yea

7 0

4 years ago

A teacher is giving an exam with 20 multiple-choice questions, each with four possible answers. The teacher's null hypothesis

frutty [35]

Answer:

That means that there´s a 0.01 of probability that the student is guessing.

Remember that the significance level is related to the strength of the evidence before rejecting the null hypothesis. The Significance level is the probability of rejecting the null hypothesis if it is true.

For example if the significance level is 0.03 it will indicate that there is a 3% of probability that students are guessing.

Lower significance levels indicate that you require stronger evidence before you will reject the null hypothesis.

So we can say that the teacher needs more evidence before rejecting the null hypothesis.

5 0

3 years ago

Find the xx-intercept of each line defined below and compare their values.

alexandr1967 [171]

Answer:

$\displaystyle greater\:than \\ Line\:B: [-6, 0] \\ Line\:A: [2, 0]$

Step-by-step explanation:

The x-intercept of Line B is already given to you because it is where the graph intersects the x-axis.

Now, to get the x-intercept of Line A, plug 0 in for y to get this:

0 = −2x + 4

- 4 - 4

_____________

$\displaystyle \frac{-4}{-2} = \frac{-2x}{-2} \\ \\ 2 = x$

So, the x-intercept of Line A is $\displaystyle [2, 0],$ and since 2 is greater than −6, greater than would be your answer.

I am joyous to assist you anytime.

5 0

3 years ago

Im horrible at fractions and exponets

vredina [299]

The third one is the answer?

6 0

3 years ago

Read 2 more answers

Please help with composite solid problem!!!

kolbaska11 [484]

Well, we know that the first one is correct because those are the only two shapes up there. The second one is correct because a*b*c is equal to the rectangular prism, while 1/2(a*b*[d-c]) is equal to the triangular one.

Keeping in mind that 1/2*d = c, the third one is also correct because when you simplify the equation, you get
$a*b* \frac{1}{2}d - \frac{1}{2}c + c$
$a*b* c - \frac{1}{2}c + c$
$a*b*1 \frac{1}{2}c$
This is equal to the volume because the overall height is 2, but since it's a triangular prism, we take away one half. Because it's all multiplication, we can actually arrange all the values. But the point is that the third one is right, too, leaving the last one to be wrong.

So the last one has to be the answer. Whew!

8 0

4 years ago