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3 years ago

2 factors of 28 add up to 9 what are they

Mathematics

2 answers:

bogdanovich [222]3 years ago

5 0

It is 2 and it is 7 the two factors your welcome

salantis [7]3 years ago

5 0

Think of all the factors that equal 28 and line them up smallest to greatest.

1, 2, 4, 7, 14, 28

Look at all the numbers, and try adding some of them together.

Let's start with 1.

1+2=3 ×
1+4=5 ×
1+7=8 ×

Well, 1 isn't one of the factors because no matter which factor you add it to, it'll be either larger or smaller than 9.

Let's try 2.

2+1=3 ×
2+4=6 ×
2+7=9 √

The factors 2 & 7 added together equal 9.

Hope this helps.

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Which of the following is an extraneous solution of (45-3x)^1/2=x-9?

Iteru [2.4K]

Answer:

C. x =3

Step-by-step explanation:

Extraneous solution is that root of a transformed equation that doesn't satisfy the equation in it's original form because it was excluded from the domain of the original equation.

Let's solve the equation first

$\sqrt{45-3x} = x-9\\Taking\ square\ on\ both\ sides\\{(\sqrt{45-3x})}^2 = {(x-9)}^2\\45-3x = x^2-18x+81\\0 = x^2-18x+81-45+3x\\x^2-15x+36 = 0\\x^2-12x-3x+36 = 0\\x(x-12)-3(x-12) = 0\\(x-3)(x-12)\\x-3 = 0\\=> x =3\\x-12 = 0\\x = 12\\We\ will\ check\ the\ solutions\ one\ by\ one\\So,\\for\ x=3\\\sqrt{45-3(3)} = 3-9\\\sqrt{45-9} = -6\\\sqrt{36}= -6\\6\neq -6\\For x=12\\\sqrt{45-3(12)} = 12-9\\\sqrt{45-36} = 6\\\sqrt{36}= 6\\6=6$

Hence, we can conclude that x=3 is an extraneous solution of the equation ..

3 0

4 years ago

Adam got 97, 70, 89, 99, 100, 78, 79, 89, 77, and 72 on his reading test. What is the mean of Adam's reading test?

ipn [44]

Answer: 85

Add up all the numbers: 97+70+89+99+100+78+79+89+77+72=850

Divide 850 by the amount of numbers:

850/10=85

I hope this helps and good luck! :)

5 0

3 years ago

I need help with probability help me answer this question correctly.

OleMash [197]

answer for this question is 2/19

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3 years ago

Help me on my geometry hw it’s due in 25 minutes

icang [17]

Answer:

now just half the first triangals answers

Step-by-step explanation:

x =21

y=24

TH=24 PQ=12

RH=24 NQ=12

RT=21 NP=10.5

>T=80 >P=80

>H=20 >Q=20

>R=80 >N=80

8 0

3 years ago

Read 2 more answers

If y varies inversely as x, and y=6 when x=3. Then find the value of y when x=32

s2008m [1.1K]

Answer: y = 18/32

Step-by-step explanation: Okay the equation is xy = k

You plug in x and y.

(3)(6) = k

18 = k

To get the value of y when x = 32 you plug in 32.

Use this equation now y = k/x

Now it is y = 18/32

And that is your answer!

7 0

3 years ago