Mathematics High School

Rebecca solved
√45 + 2 √20. Her answer was 5 √5 . Is she correct? If not, explain and correct the error.

Rebecca Solved 45 + 2 20. Her Answer Was 5 5 . Is She Correct? If Not, Explain And Correct The Error.

Answers

Answer 1

No.

[tex]\sqrt{45}=3\sqrt{5} \\2\sqrt{20} =2\sqrt5}[/tex]

If you add them up you DO NOT GET [tex]5\sqrt{5}.[/tex] According to mathematics, it equals to [tex]7\sqrt{5}[/tex].

Related Questions

Find the twenty-seventh term of the arithmetic sequence 21, 18, 15, ...

Answers

Answer: -57

Step-by-step explanation: 21, 18, 15, 12, 9, 6, 3, 0, -3, -6, -9, -12, -15, -18, -21, -24, -27, -30, -33, -36, -39, -42, -45, -48, -51, -54, -57

It is decreasing by 3 each turn. Therefore, the 27th term would be -57.

Can anyone help me please

Answers

Answer:

Step-by-step explanation:

Sorry bro can’t help you on that one

The Bigtown football team outscored its opponents 5:2 last season. If their opponents scored 38 points, how many points did Big Town score? (Hint: Bigtown is first in the ratio)

Answers

Answer:

95 points

Step-by-step explanation:

Let P = Big Town's points

5/2 = P/38

2P = 190

P = 95 points

If f(x)= 3x^3+4 find f(-3)

Answers

The answer would be -77

What is 3/16 divided 3/8

Answers

Answer:

1/2 OR 0.5

Step-by-step explanation:

(*￣3￣)╭

Answer:

1/2

Step-by-step explanation:


Luis saved 5/8 of his pay. What percent of his pay did he save?

Answers

It’s 62.5%

Have a great day! The steps are down below

Please answer by today

Answers

Answer:

y axis

Step-by-step explanation:

the y coordinate changed

1 = y / 6
need help!!!​

Answers

Answer:

y=6

Step-by-step explanation:

Isolate y by multiplying by 6

1*6=y/6*6

y=6

Check

6/6=1

Step-by-step explanation:

Here's the answer.

1=y/6

1*6=y

6=y

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Solve the absolute value equation:
|x| -7=-3

Answers

Divide by -7. This gives you |x|=the answer. Then split it into two equations like
x= the answer but positive
x= the answer but negative
Then solve both of your equations for x to get the two answers.

Answer:

Step-by-step explanation:

-3+7=4

x=4

can someone please like pretty please help me with this? i seriously need help and my teacher won’t help me with it even after I’ve told him I don’t understand it and it’s about to be due and Emmy whole grade depends on it and I have no idea how to solve it ! I’ll mark you brainleist and give a 5.0 rating, PLEASE HELP !!

Answers

Answer:

She made $1230 more on printed shirts than plain shirts in 25 weeks.

Step-by-step explanation:

Hi,

Okay, I have to admit, this is pretty complicated. But, it's not impossible :) First things first, we know that the equation in the table is the number of shirts sold after W number of weeks. We know that we need to, first, find the total number of shirts sold in 25 weeks.

The equation for the plain shirts is 5w -4. Let's start with that.

Plugin 25 for w to find the total number of plain shirts sold after 25 weeks.

5w - 4

5(25) - 4

= 121

She sold 121 plain shirts after 25 weeks. But we're not done yet, we still have to see how much money she made after selling 121 plain shirts. To do this, we have to multiply the total number of plains shirts sold by 15. (we know that each plain short costs $15, that's why we're multiplying it by 121)

When you do this...

121 x 15

You get...

$1815

She got $1815 after 25 weeks just for selling plain shirts.

Now, let's find the total cost of printed shirts after 25 weeks.

The equation for the printed shirts if 8w + 3.

8w + 3

8(25) + 3

= 203

She sold 203 printed shirts in 25 weeks. Let's find the cost. Each printed shirt costs $15 so we need to multiply 203 by 15.

203 x 15

You get...

$3045

She made $3045 by selling printed shirts in 25 weeks.

Now, we have to subtract $3045 by $1815 to find how much more she made. You get...

3045 - 1815

= $1230

She made $1230 more on printed shirts than plain shirts in 25 weeks.

I really hope this helps :)

Kip took out a loan for $750. He earned $60 in interest and his interest
rate was 4%. How long did he take to repay the loan?
1 year
2 years
2.5 years
3 years

Answers

9514 1404 393

Answer:

  (b)  2 years

Step-by-step explanation:

The interest formula is ...

  I = Prt . . . . interest rate r on principal P for t years

We can fill in the known values and solve for t.

  60 = 750·0.04·t

  60/30 = t = 2

The loan was repaid in 2 years.

What is the distance between points (-4, 5) and (8, 40) on the coordinate plane?
SOME PLEASE HELP

Answers

The distance is 37
I attached a picture


Two angles are complementary. The measure of angle W is four times the
measure of angle N plus 10 degrees. What is the measure of angle N?

Answers

W=4N+10
N+4N+10=90
5N=80
N=80/5=16

Someone please help me I’ll give out brainliest please dont answer if you don’t know

Answers

Answer:

[tex]3x-1[/tex]

Step-by-step explanation:

[tex]3+2(x-2)+x=3+2x-2.2+x=(2x+x)+(3-4)\\=3x-1[/tex]

Answer:

3x-1

Step-by-step explanation:

trust me i know

Translate the sentence into an equation.
Eighty-five less than the product of 5 and x is equal to ten.

Answers

Answer:

5x-85=10

Step-by-step explanation:

"85 less" indicates subtraction, "product of 5 and x" is multiplication. This means its 5x-85. The whole thing is equal to 10, so the equation is 5x-85=10

Which of the following expressions is equivalent to the expression below?
z (2a + b) – (4a + b)

PLEASE HELP

Answers

Answer:

-2a

Step-by-step explanation:

need help with this please

Answers

Answer:

-2/5

Step-by-step explanation:

Exactly the opposite of the sign, opposite of + is negative (-)

Which expression is equivalent to (8m + 6) + (3m - 2) ?

Answers

Answer:

(11m-4)

Step-by-step explanation:

8m+3m=11m

6-2=4

The answer to the question is 11m+4

Someone plz help me giving brainliest

Answers

Answer:

1. ROUND

2. COMMUNITIVE

3. AREA MODEL

4. MIXED NUMBERS

FALSE

FALSE

TRUE

TRUE

Step-by-step explanation:

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What is m∠X to the nearest degree?

Answers

Thinking bout 46



Step by step:
Use inverse cos law to get 44 degrees!! Hope this helps :)

Some please help me to solve this 2 problems
x=5,y=2

Answers

I got hu hago=>outer I got a scale getting him to boundless trust scale

Tracy works at Garcia’s Mexican restaurant every day from 12-8
p.m. She makes $7.25 per hour. How much money does Tracy make
in 8 hours?

Answers

I’m going to assume you aren’t deducting taxes from your total. so, your answer would be $58.

hope this helps
thanks for the free points;)

Plzz answer this asap, question is in the picture.

Answers

Answer:

This is your answer

what is the solution
y=-4x+20 y=2x-22

Answers

Answer: x=7 y=-8

Step-by-step explanation:

Here is a right square pyramid. Round answers in this problem to the nearest tenth if necessary. What is the volume of the pyramid? Remember V (square pyramid) = (1/3) Bh, where B = area of base.

Answers

Answer:

Step-by-step explanation:

r = radius h = height s = slant height V = volume L = lateral surface area B = base surface area A = total surface area π = pi = 3.14159 √ = square root

A gift box measures 8 inches by 10 inches by 3 inches. what is the surface area of the box?

Answers

Answer:

If I am correct then the answer should be 268 in2

Step-by-step explanation:

a real number between √13 and √14

Answers

Answer:

3.7

Step-by-step explanation:

What is the solution to the system of equations?
x = -4y
3x + 2y = 20

Answers

Answer:

(x, y) = (8, -2)

Step-by-step explanation:

Substitute:

3(-4y) + 2y = 20

-12y + 2y = 20

-10y = 20

y = -2

x = -4(-2) = 8

35,651,000,000 in to scientific notation

Answers

3.5651 × 10 to the tenth power

Find the area of triangle ABC (I’ll give you the branliest answer if correct) :)

Answers

I can't see pictures T^T.

To find the are of a triangle, you multiply the dimensions as you would a rectangle, but divide the product by 2.

Example:

The dimensions of triangle B are 4 and 9.

4x9=36

Now divide.

36/2=18

So the area of triangle B is 18.

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hope it helps

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