a number is multiplied by 2. then that product is multiplied by 5. write to explain how you know what digit is in the ones place of the final product

Answers

Answer 1

Answer: If the number is a multiple of 2 and 5, it must also be a multiple of 10.

Al multiples of 10 end with a 0 in the ones place.

Answer 2

Answer:

Final answer:

Multiplying any number by 2, and then by 5, results in the final product ending in 0, regardless of what the initial number was.

Explanation:

The question is about the identification of the digit in the ones place when a number is initially multiplied by 2 and that product is further multiplied by 5. Firstly, we know that any number multiplied by 2 will either end in 0, 2, 4, 6, or 8. This is because all multiples of 2 are even. Secondly, consider the product of this number (which may end in 0, 2, 4, 6, 8) being multiplied by 5. Any number ending with any of these digits, when multiplied by 5, will result in the product ending with 0. Hence, regardless of the initial number, multiplying it by 2 and then by 5 will result in a final product whose digit in the ones place is 0.

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What is the easiest way to find the perimeter of a triangle

Answers

The easiest way is to write down the length of each side, and then add up
the three numbers.

In fact, that's the ONLY way to find the perimeter. If anything else needs to
be done, that's usually because you don't know all three lengths yet, and
you have to find a missing length. Once you accomplish that, you ALWAYS
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Javier drove 45 miles. This represents 60% of his entire trip. What is the total number of miles in Javier's trip?

Answers

60% of trip = 45 miles

let total trip distance = $l$

60% is given by multiplying by 0.6

So;

$0.6l = 45 \n \n l = (45)/(0.6) \n \n \boxed{l = 75}$

.6x=45 .6=3/5 3x/5=45 x=(5/3)*45 x=75 the total miles in his trip is 75

Advance says you can double your money in 10 years if you put $1,000 and a simple interest account What annual interest rate does the Bank pay

Answers

ok
I=PRT
P=present amount
I=interst
T=time in years
R=rate in percent

when you double your money, interest=present amount
I=1000=P
T=10 years
so
1000=1000(10)(R)
1000=10000R
divide both sides by 10000
0.10=R
10% is answer

What is the LCM of 13 and 26

Answers

The lest common multiple is 26. If you do multiples of each number

13:13,26
26: 26

Both of their lest common multiples would be 26

$LCM\ is\ the\ least\ common\ number\ that\ is\ multiply\ of\ both:\n\n Factors\ of\ 13\n 13:13\n\n Factors\ of\ 26:\n 26:2\n 13:13\n\n LCM(13,26)=2*13=26\n\n \textbf{LCM(13,26)=26}$

What is the interest earned at $700 at 8% for 6 years

Answers

These problems are very confusing. I had one too. My math book has this example if it will help:

Amelia takes a taxi from the airport to a hotel. The fare is $31.50. Suppose she wants to tip the driver 15%. What would be a reasonable amount of tip for the driver?

$31.50 is about $32
15% = 10% + 5%
10% of $32 is $3.20 Move the decimal point 1 place to the left
5% of $32 is $1.60
So, 15% is about 3.20 + 1.60 or $4.80
A reasonable amount for the tip would be $5. Hope this helps. I'm stuck on a similar problem, so I can't solve it. :(

When the sum of an unknown number z and twenty-two is divided by the same unknown number, the quotient is twelve. What is the unknown number?

Answers

z+22/z = 12
z+22=12z
22=11z
2=z

Hope this helps. Just say if you need more of an explanation.

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