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3 years ago

Help me on 12 and 13 please and fast

Mathematics

1 answer:

lys-0071 [83]3 years ago

3 0

Answer:

12. B , 13. 4

Step-by-step explanation:

$12. \frac{3}{12}+\frac{1}{12} +\frac{2}{12} =\frac{6}{12} =\frac{1}{2} \\13. 5-(\frac{2}{10} *5)=4$

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Vertical angles must : check all that apply

trapecia [35]

Answer: B and C

Step-by-step explanation: For A, vertical angles can be complimentary or supplementary. For D, vertical angles can sometimes be acute but not always.

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2 years ago

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You purchased a new car for 17,999 in the year 2015. It is now 2020 and you want to sell your car for a fair price. If your car

salantis [7]

Answer:

$7,986.25

Step-by-step explanation:

We can use the following formula to solve:

$A=P(1-r)^t$

P = principal value

r = rate (decimal)

t = time (years)

First, change 15% into a decimal:

15% -> $\frac{15}{100}$ -> 0.15

Since 2015 and 2020 are 5 years apart, we will use 5 for t. Now, plug the values into the equation:

$A=17,999(1-0.15)^5$

$A=7,986.25$

Your car would be worth $7,986.25

8 0

3 years ago

Write the null and alternative hypotheses in words and then symbols for each of the following situations.

Marrrta [24]

Answer:

A) the hypothesis in words and symbols are;

Null hypothesis: Grades have not improved for most students

Alternative hypothesis: Grades have improved for most students

Null hypothesis; H0: p^ = 0.5

Alternative hypothesis; Ha: p^ > 0.5

B) Null hypothesis: During march madness, employees averaged 15 minutes per day on non - business activities

Alternative hypothesis: During march madness, employees averaged more than 15 minutes per day on non-business activities

Null hypothesis; H0: μ = 15

Alternative hypothesis; Ha: μ > 15

Step-by-step explanation:

A) We are told that they sampled 200 of the students who used their service in the past year and ask them if their grades have improved or declined from the previous year. Thus, there will be a 50% chance of success for their grades to have improved and a 50% chance for it to remain the same.

Thus; p^ = 0.5

So the hypothesis in words and symbols are;

Null hypothesis: Grades have not improved for most students

Alternative hypothesis: Grades have improved for most students

Null hypothesis; H0: p = 0.5

Alternative hypothesis; Ha: p > 0.5

B) We are told that they estimate that on a regular business day employees spend on average 15 minutes of company time checking personal email, making personal phone calls, etc

Also, They also collect data on how much company time employees spend on such non-business activities during March Madness.

The hypotheses in words and symbols are;

Null hypothesis: During march madness, employees averaged 15 minutes per day on non - business activities

Alternative hypothesis: During march madness, employees averaged more than 15 minutes per day on non-business activities

Null hypothesis; H0: μ = 15

Alternative hypothesis; Ha: μ > 15

6 0

3 years ago

Identify the property used in each step of solving the inequality 3x-2>-4.

WARRIOR [948]

Addition property of equality

Division property of equality

Solution:

Given inequality is:

3x - 2 > 4

$\mathrm{Add\:}2\mathrm{\:to\:both\:sides}$

Here, Addition property of equality is used

When the same amount is added to both sides of an inequality, then the inequality is still true

3x - 2 + 2 > 4 + 2

3x > 6

$\mathrm{Divide\:both\:sides\:by\:}3$

Here, Division property of equality is used

When we divide both sides of an equation by the same nonzero number, the sides remain equal.

$\frac{3x}{3}>\frac{6}{3}\\\\x > 2$

Thus the property used in each step of solving the inequality is found

8 0

3 years ago

Oliver traveled 124.25 miles in 3.5 hours at a constant speed. What is the constant of proportionality in miles per hour?

Elan Coil [88]

Answer:

Simple!

All you have to do is divide 3.5 by 124.25

124.25 / 3.5 = 35.5

Your answer is C.

Hope this helps!

3 0

4 years ago

Read 2 more answers