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2 years ago

Help please I’m lost

Mathematics

1 answer:

zaharov [31]2 years ago

8 0

Answer:

Step-by-step explanation:

f(3)=5(3)²-7(4(3)+3))

=45-105

= -60

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Which expression is equivalent

gtnhenbr [62]

Answer:

Option B is correct.

$\frac{81m^2n^5}{8}$ is equivalent to $\frac{(3m^{-1}n^2)^4}{(2m^{-2}n)^3}$

Step-by-step explanation:

Given expression: $\frac{(3m^{-1}n^2)^4}{(2m^{-2}n)^3}$

Using exponents power:

$(ab)^n = a^nb^n$

$(a^n)^m = a^{nm}$

$a^m \cdot a^n = a^{m+n}$

Given: $\frac{(3m^{-1}n^2)^4}{(2m^{-2}n)^3}$

Apply exponent power :

⇒ $\frac{3^4 (m^{-1})^4(n^2)^4}{2^3(m^{-2})^3 n^3}$

⇒ $\frac{81 m^{-4}n^8}{8m^{-6}n^3} = \frac{81 m^{-4} \cdot m^6 n^8 \cdot n^{-3}}{8}$

⇒ $\frac{81 m^{-4+6} n^{8-3}}{8} = \frac{81 m^2 n^5}{8} = \frac{81m^2 n^5}{8}$

Therefore, the expression which is equivalent to $\frac{(3m^{-1}n^2)^4}{(2m^{-2}n)^3}$ is, $\frac{81m^2 n^5}{8}$

4 0

3 years ago

Read 2 more answers

Sophie and Simon are peeling a pile of potatoes for lunch in the cafeteria. Sophie can peel all the potatoes by herself in 45 mi

natima [27]

Answer:

18 Minutes

Step-by-step explanation:

Simon and sophie each do a fraction of the job per minute like this:

-Simon does $\frac{1}{30}$ per minute (if we multiply this by 30 we have the completed job)

-Sophie does $\frac{1}{45}$ of the job per minute (again if we multiply this by 45 we have the completed job)

We will add this two to know how much of the job they do together in a minute:

$\frac{1}{30}+\frac{1}{45}=\frac{1}{18}$

They will do $\frac{1}{18}$ of the job per minute.

So the total time will be when they do $\frac{18}{18}=1$ , we can put this in one equation like this:

$\frac{1}{18}x=1$

where x is the total times we need to do $\frac{1}{18}$ of the job to complete it. We solve for x:

$x=18minutes$

5 0

3 years ago

Read 2 more answers

HELP NEED AN ANSWER DUE TODAY!!

AnnyKZ [126]

z < 1.25

I used mathaway it's correct

4 0

2 years ago

On a map, 1 inch represents 60 miles. The towns of Howell and edgerton 2-3-4 inches apart on the map.

Archy [21]

Answer:

okay that's not a question

Step-by-step explanation:

so no

7 0

2 years ago

Find the least number which must be added to 1825 to get a perfect square find the square root of the perfect squre so obtained

timofeeve [1]

X+1825=y^2
sqrt（1825）=42.8
so the least is y^2=43^2=1849
so x=1849-1825=24

7 0

3 years ago