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Vlad [161]
3 years ago
7

Evaluate j/k -0.2k when j =25 and k = 5

Mathematics
2 answers:
denis-greek [22]3 years ago
5 0
When you have an equation that has variables and you know the value of those variables, just plug it it. So plugging the vaules we get
\frac{25}{5}-\frac{1}{5}5
Just evaluating we get 4
vredina [299]3 years ago
3 0

Answer:

4

Step-by-step explanation:

To evaluate a function with certain defined values, we must <em>substitute</em> the values ​​in the equation, perform the indicated operations and in this way we obtain the final value.

If j = 25  and k=5

replacing in the equation

\frac{j}{k} -0.2k = \frac{25}{5} -0.2(5)  = 5 -1 = 4

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A 2-digit number is increased by 36 when the digits are reversed. The sum of the digits is 10. What is the original number?
gregori [183]
<h3>Answer: 37</h3>

====================================================

Work Shown:

T = tens digit of the original number

U = units digit of the original number

U+T = 10 since the digits add to 10. Solve for U to get U = 10-T

10T+U = original number

10U+T = new number where digits are reversed

-----------

new number = (old number) + 36

10U+T = (10T+U)+36

10U+T = 10T+U+36

10(10-T)+T = 10T+10-T+36 ... plug in U = 10-T

100-10T+T = 10T+10-T+36

-9T+100 = 9T+46

100-46 = 9T+9T

54 = 18T

18T = 54

T = 54/18

T = 3 is the tens digit of the original number

U = 10-T

U = 10-3

U = 7 is the units digit of the original number

10T+U = 10*3+7 = 30+7 = 37 is the original number

73 is the reversed number.

73-37 = 36 is the difference, showing that 37 increased by 36 leads to 73. The answer is confirmed.

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Factor as the product of two binomials x ^2 -4
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