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3 years ago

This isnt urgent but i need an answer, i will give the person who answers correctly brainliest, please try

Mathematics

1 answer:

SSSSS [86.1K]3 years ago

8 0

Answer: 3, 5, 7

Step-by-step explanation:

There is a "trick" to determine divisibility by 3: if the sum of the digits is divisible by 3, the number is divisible by 3.

3 + 1 + 5 = 9 which is a multiple of 3, so 315 is divisible by 3.

It works for 9 also. since the sum of the digits is 9, 315 is divisible by 9.

Divisibility by 5: any number that has the units digit 5 or 0 is divisible by 5.

For 7, I just tried it 315÷7= 45

Only even numbers are divisible by 2.

If a 3-digit number is divisible by 11, the middle digit will be the sum of the first and last digits. (That is not the case for 315) But 385 is divisible by 11, also 495, 253, and many others you can try for fun.

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The probability that a comic book reader in a particular city prefers comics published by Company A is 25%. The probability that

Andrew [12]

We know that 70% of all comic book fans are male, and that 40% of Company A fans are male.

Since 25% of all comic book fans are company A fans:
0.4 * 0.25 (meaning 40% of 25%) = 0.1, or 10% of all comic book fans are male company A fans.

What percentage, then, of male comic book fans are company A fans?
0.1 ÷ 0.7 = 0.142
We divide 10%, the percentage of all comic book fans that are male and company A fans, by the percentage of comic book fans that are male, since we are given that the fan is male.

Answer is 0.14

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3 years ago

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3 years ago

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Assume that y varies inversely with x. If y= 1.6 when x= 0.5, find x when y= 3.2

solniwko [45]

Answer:

x = 0.25

Step-by-step explanation:

If y varies inversely with x, then:

$y \propto \dfrac{1}{x} \implies y=\dfrac{k}{x} \quad \textsf{(for some constant k)}$

Given:

y = 1.6 when x = 0.5

Substitute the given values into the found equation and solve for k:

$\implies 1.6=\dfrac{k}{0.5}$

$\implies k=1.6(0.5)$

$\implies k=0.8$

Therefore:

$y=\dfrac{0.8}{x}$

To find the value of x when y = 3.2, substitute y = 3.2 into the found equation and solve for x:

$\implies 3.2=\dfrac{0.8}{x}$

$\implies x=\dfrac{0.8}{3.2}$

$\implies x=0.25$

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Step-by-step explanation:

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