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3 years ago

Which answer choice correctly uses grouping symbols to make an expression equivalent to 312

Mathematics

1 answer:

Andrew [12]3 years ago

4 0

The answer is 3×(4+3^2)×8

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Phyllis invested 47000 dollars, a portion earning a simple interest rate of 4 percent per year and the rest earning a rate of 6

Alexandra [31]

Answer:

31000 dollars were invested at 4% interest rate.

16000 dollars were invested at 5% interest rate.

Step-by-step explanation:

Convert the interest rate into decimal and then write down two equations to solve for the unknowns.

$\begin{bmatrix}0.04x+0.06y=2200\\ x+y=47000\end{bmatrix}$

$\mathrm{The\:solutions\:to\:the\:system\:of\:equations\:are:}\\\\x=31000,\:y=16000$

Best Regards!

5 0

3 years ago

A certain quantity decays exponentially over time. The initial quantity at t = 0 is 25,000. The quantity decays at a rate of 5%.

7nadin3 [17]

In order to sole the problem you need to create an equation to model what you are trying to do.
You end up with an equation looking like
25000*0.95^t
25000 is the starting value when t=0
95% is the amount remaining after the 5% decay
0.95 is being raised to the power of t to determine how many times it has decayed
When t=3 the equation should be
25000*0.95^3=21434.375

3 0

4 years ago

Read 2 more answers

Larry spent 75% of his weekly allowance a ticket for a concert. The ticket cost $15. How much is Larry's weekly allowance?

fredd [130]

Answer:

Step-by-step explanation:

75% of 20 = 15

I believe this is correct and hope it helps :)

3 0

3 years ago

Geometry questions, help ya girl out

coldgirl [10]

Answer:

3. a

4. d

5. a

Step-by-step explanation:

7 0

3 years ago

A piece of pipe is 303/4 inches long. If five pieces, each 41/3 inches long, are cut from the pipe, how many inches of pipe rema

galina1969 [7]

So, what is the total lenght of the pieces that wer cut off?

we multiply the lenght by the number:

4 $\frac{1}{3}$ *5=20+ $\frac{5}{3}$ =21 $\frac{2}{3}$

and we subtract this from the original pipe, that is

30 $\frac{3}{4}$ -21 $\frac{2}{3}$

we need to bring the two fractions to the same denominator (by multiplying the fraction art in the first by 3 and 4 the second):

30 $\frac{9}{12}$ -21 $\frac{8}{12}$ =9 $\frac{1}{12}$

so the correct answer is D!

3 0

3 years ago