Answer:
12x = 84
Step-by-step explanation:

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Steps To Solve:
~Find common denominators
4 2/7 = 4 10/35
2 1/5 = 2 7/35
~Turn into improper fractions
4 10/35 = 150/35
2 7/35 = 77/35
~Multiply
150/35 x 77/35 = 11,550/1,225
~Simplify
11,550/1,225 = 9 525/1,225 = 9 105/245 = 9 21/49 = 9 3/7
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Answer:
9 3/7
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Hope This Helped! Good Luck!
To solve this problem we are going to use the simple interest formula:

where

is the sum of the <span>interest and the principal
</span>

is the principal

is the interest rate in decimal form

is the time in years
<span>
We know for our problem that </span>

,

, and

. Now, let

represents our interest rate. To express the interest rate in decimal form, we are going to divide the rate by 100%:


.
Now that we have all the values we need, lets replace them in our simple interest formula to find the interest rate:

![21000=15000[1+(0.01x)(5)]](https://tex.z-dn.net/?f=21000%3D15000%5B1%2B%280.01x%29%285%29%5D)




We can conclude that the interest rate of your cousin's loan was 8%.
Answer:
15,240,960 serial numbers
Step-by-step explanation:
Since no repeats are allowed and the order matters, the number of possible serial numbers is given by the product of the permutation of 4 out of 9 letters by the permutation of 4 out of 10 numbers:

There are 15,240,960 ways to generate a serial number.
230 times .30 is 69 so sub that from 230 you get 161