1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
defon
3 years ago
14

If anyone can help with this ill mark Brainly

Mathematics
1 answer:
Natalka [10]3 years ago
6 0

Answer:

In this case, we can do substitution.

Step-by-step explanation:

For the first one, (s - t)(x) = ((x - 5) - 4x^2)(x) = x^2 - 21x

For the second one, (s*t)(x) = ((x - 5) *4x^2)(x) = 4x^4 - 20x^3

And for the last one,  (s+t)(-2) = ((x - 5) + 4x^2)(-2) = -8x^2 - 2x + 10

Hope your happy with the answer :)

You might be interested in
Solving the equation 5x + 4 = 19​
user100 [1]

Step-by-step explanation:

5x = 19 - 4

5x = 15

x = 15/ 5

= 3

hope it helps!

6 0
2 years ago
Read 2 more answers
A phone manufacturer wants to compete in the touch screen phone market. He understands that the lead product has a battery life
alisha [4.7K]

Answer:

a)

The null hypothesis is H_0: \mu \leq 10

The alternative hypothesis is H_1: \mu > 10

b-1) The value of the test statistic is t = 1.86.

b-2) The p-value is of 0.0348.

Step-by-step explanation:

Question a:

Test if the battery life is more than twice of 5 hours:

Twice of 5 hours = 5*2 = 10 hours.

At the null hypothesis, we test if the battery life is of 10 hours or less, than is:

H_0: \mu \leq 10

At the alternative hypothesis, we test if the battery life is of more than 10 hours, that is:

H_1: \mu > 10

b-1. Calculate the value of the test statistic.

The test statistic is:

We have the standard deviation for the sample, so the t-distribution is used to solve this question

t = \frac{X - \mu}{\frac{s}{\sqrt{n}}}

In which X is the sample mean, \mu is the value tested at the null hypothesis, s is the standard deviation and n is the size of the sample.

10 is tested at the null hypothesis:

This means that \mu = 10

In order to test the claim, a researcher samples 45 units of the new phone and finds that the sample battery life averages 10.5 hours with a sample standard deviation of 1.8 hours.

This means that n = 45, X = 10.5, s = 1.8

Then

t = \frac{X - \mu}{\frac{s}{\sqrt{n}}}

t = \frac{10.5 - 10}{\frac{1.8}{\sqrt{45}}}

t = 1.86

The value of the test statistic is t = 1.86.

b-2. Find the p-value.

Testing if the mean is more than a value, so a right-tailed test.

Sample of 45, so 45 - 1 = 44 degrees of freedom.

Test statistic t = 1.86.

Using a t-distribution calculator, the p-value is of 0.0348.

5 0
2 years ago
What is 60 /−3 and how do you solve
SVETLANKA909090 [29]
The answer is -20 and you solve by putting it in the calculator
7 0
2 years ago
Read 2 more answers
N a basketball game, Archie made 3/5 of his shots. Which numbered choice has a value that is the same as the ratio Archie made i
Mamont248 [21]

Basically you want to find an equivalent fraction for 3/5 in the answer choices.

12/20 equals 3/5 because 3/5 x 4/4 (or 1) = 12/20

answer: 4

8 0
3 years ago
A tire has a radius of 13 inches. Which equation could be used to find the circumference of the tire
pav-90 [236]

Answer:

the tire should be 16 inches in diameter

a way that you can find diameter is if you are given the radius and you just multiply that number by 2 or ADD the same number because usually it is half of the diameter

6 0
2 years ago
Other questions:
  • Wich pair of equations below represents perpendicular lines? <br><br> Please!!!
    7·2 answers
  • 19. Simplify 3√ 2 – √ 2 . <br><br> A. 4√ 2 <br> B. 2√ 2 <br> C. √ 2 <br> D. 3√ 2
    14·2 answers
  • Can someone help I don’t understand this!?
    6·2 answers
  • Hereeeeeeeee:) hellllllpppp
    14·2 answers
  • Find the value for x
    15·1 answer
  • What’s the distance between (3.5, 1) and (-4, 2.5)
    5·1 answer
  • ,..............................
    11·1 answer
  • NEED ANSWER ASAP WILL GIVE BRAINLIEST
    10·2 answers
  • There are 17 red and blue pens, among which r are red. How many are blue? Denote blue pens as b.
    7·1 answer
  • Only 100 points for you to answer to my math word problem question but please don’t post a very useless answer on The Brainly! &
    9·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!