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2 years ago

HELP ME PLZZ I NEED HELP WITH THIS!!

Mathematics

2 answers:

blondinia [14]2 years ago

8 0

-4°F
Over three hours, the temperature drops 12 degrees. -12/3 = -4, so the average change is -4°F

victus00 [196]2 years ago

6 0

Answer:D

Step-by-step explanation:

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What is the solution to the equation below?Round your answer to two decimal places.3*In x=9.9

storchak [24]

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3 years ago

An Environmental Club collected 100 pounds of aluminum cans to recycle. 1 point

MissTica

Answer:

well, there are 52 weeks in a year, so if you just multiply the pounds of cans by the amount of years, you get 1,300

Step-by-step explanation:

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4 0

3 years ago

Help!! 50 points and brainliest!

Viktor [21]

Answer:

Second choice:

$x=2t$

$y=4t^2+4t-3$

Fifth choice:

$x=t+1$

$y=t^2+4t$

Step-by-step explanation:

Let's look at choice 1.

$x=t+1$

$y=t^2+2t$

I'm going to subtract 1 on both sides for the first equation giving me $x-1=t$ . I will replace the $t$ in the second equation with this substitution from equation 1.

$y=(x-1)^2+2(x-1)$

Expand using the distributive property and the identity $(u+v)^2=u^2+2uv+v^2$ :

$y=(x^2-2x+1)+(2x-2)$

$y=x^2+(-2x+2x)+(1-2)$

$y=x^2+0+-1$

$y=x^2$

So this not the desired result.

Let's look at choice 2.

$x=2t$

$y=4t^2+4t-3$

Solve the first equation for $t$ by dividing both sides by 2:

$t=\frac{x}{2}$ .

Let's plug this into equation 2:

$y=4(\frac{x}{2})^2+4(\frac{x}{2})-3$

$y=4(\frac{x^2}{4})+2x-3$

$y=x^2+2x-3$

This is the desired result.

Choice 3:

$x=t-3$

$y=t^2+2t$

Solve the first equation for $t$ by adding 3 on both sides:

$x+3=t$ .

Plug into second equation:

$y=(x+3)^2+2(x+3)$

Expanding using the distributive property and the earlier identity mentioned to expand the binomial square:

$y=(x^2+6x+9)+(2x+6)$

$y=(x^2)+(6x+2x)+(9+6)$

$y=x^2+8x+15$

Not the desired result.

Choice 4:

$x=t^2$

$y=2t-3$

I'm going to solve the bottom equation for $t$ since I don't want to deal with square roots.

Add 3 on both sides:

$y+3=2t$

Divide both sides by 2:

$\frac{y+3}{2}=t$

Plug into equation 1:

$x=(\frac{y+3}{2})^2$

This is not the desired result because the $y$ variable will be squared now instead of the $x$ variable.

Choice 5:

$x=t+1$

$y=t^2+4t$

Solve the first equation for $t$ by subtracting 1 on both sides:

$x-1=t$ .

Plug into equation 2:

$y=(x-1)^2+4(x-1)$

Distribute and use the binomial square identity used earlier:

$y=(x^2-2x+1)+(4x-4)$

$y=(x^2)+(-2x+4x)+(1-4)$

$y=x^2+2x+-3$

$y=x^2+2x-3$ .

This is the desired result.

3 0

3 years ago

Read 2 more answers

Select the correct answer.<br> How can you write the expression 2 − (p + 6) in words?

ololo11 [35]

The written form of the mathematical expression as given in the task content; 2 − (p + 6); is; the difference between 2 and the sum of p and 6.

<h3>What is the written form of the mathematical expression given in the task content?</h3>

It follows from the task content that the expression given is; 2 − (p + 6).

Since, the expression in the parentheses can be expressed in words as the sum of; p and 6.

Hence, it follows that the whole expression can be expressed as the difference between 2 and the sum of p and 6.

Read more on expression in words;

brainly.com/question/4344214

#SPJ1

5 0

1 year ago

Please solve the following question.

romanna [79]

Can you add the question please.

5 0

2 years ago