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Roman55 [17]
3 years ago
14

Which number is prime? A. 57 B. 63 C. 51 D. 59

Mathematics
2 answers:
velikii [3]3 years ago
7 0
It's D. 59, because all of the other numbers are divisible by 3, and you can tell by adding up the digits. (5 + 7 = 12, 3 × 4 = 12) (6 + 3 = 9, 3 × 3 = 9) (5 + 1 = 6, 3 × 2 = 6)
7nadin3 [17]3 years ago
5 0
D. 59 is the answer
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The sum of two numbers is 43 . The smaller number is 19 less than the larger number. What are the numbers?
Setler [38]
Let the smaller number be x and the larger number be y.
We can calculate this by using simultaneous equation, aka listing 2 equations out.
From given,
X + y = 43
Let this be equation no. 1
X + 19 = y
Let this number be equation 2.
We can do simultaneous equations either by substitute method or elimination. In this case I'm using substitute.
We can already obtain the value of y (in terms of x) in euqation no. 2, so all we gonna do is to put y into equation 1.
X + x + 19 = 43
Solve this by algebra.
2x = 43 - 19
X = 12
Now we know the exact value of x
Now substitute x = 12 into equation no. 2
12 + 19 = y
Y = 31
So the answer is 12 and 31
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3 years ago
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3 0
3 years ago
John and Loretta Smith are in the 28% tax bracket. Their joint taxable income is $134,899. If the first $16,050 is taxed at 10%,
alexgriva [62]
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6 0
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Read 2 more answers
What is -5.8+(-2.5)
Scilla [17]

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since both the number are negative you simply add the numbers and use the negative sign.

5 0
3 years ago
What is decrease £20 by 15%
Charra [1.4K]
15\%\cdot\pounds20=0.15\cdot\pounds20=\pounds3\\
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3 years ago
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