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3 years ago

10

DeShawn deposited $6500 into a bank account that earned 11.5% simple interest each year. He earned $4485 in interest before clos

ing the account. If no money was deposited into or withdrawn from the account, for how many years was the money in the account?

1 answer:

daser333 [38]3 years ago

3 0

6 hope this helps! :)

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Why can you use cross products to solve the proportion StartFraction 18 over 5 EndFraction = StartFraction x over 100 EndFractio

gtnhenbr [62]

9514 1404 393

Answer:

it is application of the multiplication property of equality

Step-by-step explanation:

You can use "cross products" to solve any proportion. What looks like a "cross product" is just application of the multiplication property of equality. That property says the variable value is unchanged if both sides of the equation are multiplied by the same value.

For your fraction, the "cross product" is what you get when you multiply both sides of the equation by 500.

$\dfrac{18}{5}=\dfrac{x}{100}\qquad\text{given}\\\\\dfrac{18\cdot5\cdot100}{5}=\dfrac{x\cdot5\cdot100}{100}\qquad\text{multiply by $5\cdot100$}\\\\18\cdot100=5\cdot x\qquad\text{cancel common factors; looks like cross product}$

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Note that the next step here is to divide by the x-coefficient, the 5 that was in the left-side denominator.

$\dfrac{18\cdot100}{5}=x\qquad\text{divide by 5}$

Please also note that this is exactly the same result you would get by multiplying the original equation by the original denominator of x.

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3 years ago

If Janet scored an 85% on her test she answered 34 questions correctly how many questions were on the test

Wittaler [7]

40 questions. You set up a proportion, mutiply 34 by a 100 and get 3400. Then you divide 3400 by 85 and you get ur answer. You could also try guessing by putting in random values you think are the whole number and multiplying them by 0.85. So if you guess 44 is the whole and try checking it by multiplying it by .85 and get a value thats higher than the value the percentage is equal to you try another smaller value. So if 44 doesn't work you can try 40. 40 times .85 is 34 so your answer of 40 questions is correct.

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Answer:

yes this is maybe?

Step-by-step explanation:

I had a feeling it wast maybe but maybe its are?

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A liter is 0.264 gallons so 13 * 0.264 = 3.432 and round it up it is 3.4

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