MATHEMATICS MIDDLE SCHOOL

PLEASE HELPIn the middle of the afternoon, the temperature outside was 0 °F. An hour later, the temperature had decreased by 12 °F. An hour after that, the temperature had decreased by another 4 °F. What increase in temperature is needed to return to the original temperature of 0 °F?

A
4 °F

B
8 °F

C
12 °F

D
16 °

Answers

Answer 1

Answer:

Answer:

D. 16 °F

Step-by-step explanation:

Given:

The initial temperature of the outside is 0 °F.

Decrease in the temperature in the first hour = 12 °F

Therefore, temperature after 1 hour = 0 - 12 = -12 °F

Now, decrease in the temperature in the second hour = 4 °F

Therefore, temperature after 2 hours = -12 - 4 = -16 °F

Let 'x' °F be added to the final temperature in order to bring it to 0 °F.

Therefore,

$x+(-16)=0$

Adding 16 on both sides, we get:

$x-16+16=0+16\nx=16\ \°F$

Hence, we need to increase the temperature by 16 °F to attain the same initial temperature of 0 °F.

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Answers

ok here is how to solve these I hope this helps
7 = 2-5m
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-Hope this helps :)

I have 3 questions needed! Help please! You can get 25 points! Please please please help me! Thanks!1) Chole spent 15% of her allowance this month on bread. If she spent $45 on the bread, what was the total allowance?

2) A table cost $350. There is also a sales tax of 7%. How much does the table costs including the sales tax?

3) Joey bought a vintage t-shirt for $20. Then she turned around and sold it on eBay for $26. What was the percent increase in the price of the shirt?

Answers

1. so we are looking for how much her allowance is. Well we know that to get a percentage we just have to do the part over the whole and multiply by 100

so our equation looks like this
(45/x) *100 = 15%

we can change it to
45/x = .15
we need to solve for x. so let get
45 = .15x
45/.15 = x

x = 300

2. You do this by first finding out how much tax there is so
350 * .07 = 24.5
now add that to 35
350 + 24.5 = 374.5

3. So we got figure out how much she marked it up it just like the tax problem but in reverse
26 - 20 = 6
20 * x = 6
where x is the percent we are looking for

x = 6/20
x = .3
so she marked up 30%

the kinetic energy of a moving object can be calculated from the expression 1/2mv[2], where m is the mass of the object in kilograms and v is its speed in meters per second. find the kinetic energy of a 145-kg baseball that is thrown at a speed of 40 meters per second

Answers

So, we plug the values back into the formula. 1/2(145)(40)^2

First we square velocity, so it will be: 1600.

Then 1600*145 = 232000

Divide this by 2, so: 116,00

So, the kinetic energy would be 116,000.

HELP ME PLEASE :D :D

Answers

Make proportions and reduce them.
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The two rectangles are similar proportionally with a ratio of 2:3.

Does that answer your question?

5. L1. Tisha collects old books. She has
2 shelving units, and each shelving
unit has 3 shelves. Each shelf holds
12 books. If both shelving units are
filled with books, how many books
does Tisha have in all