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2 years ago

2. Which of the following numbers are prime? a) 53 b) 12 c) 18 d) 28

Mathematics

2 answers:

vovikov84 [41]2 years ago

7 0

Answer:

a) 53 is prime

Step-by-step explanation:

Shtirlitz [24]2 years ago

6 0

Answer:

C,D

Step-by-step explanation:

A Prime number is a natural number greater than 1 that is not a product of two smaller natural numbers. A natural number greater than 1 that is not prime is called a composite number. For example, 5 is prime because the only ways of writing it as a product, 1 × 5 or 5 × 1, involve 5 itself

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The circumference of a circle is 65?. In terms of pi, what is the area of the circle?

iVinArrow [24]

Answer:

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Step-by-step explanation:

A few formulas an definitions which will help us:

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$A=\pi r^2\\=\pi\left(\frac{d}{2}\right)^2\\=\pi\left(\frac{d^2}{4}\right)\\=\pi\left(\frac{(c/\pi)^2}{4}\right)\\=\pi\left(\frac{c^2/\pi^2}{4}\right)\\=\pi\left(\frac{c^2}{4\pi^2}\right)\\\\=\frac{\pi c^2}{4\pi^2}\\ =\frac{c^2}{4\pi}$

We can now substitute c for our circumference, 65, to get our answer in terms of π:

$A=\dfrac{65^2}{4\pi}=\dfrac{4225}{4\pi}=1056.25\pi$

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3 years ago

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2. Which of the following numbers are prime? a) 53 b) 12 c) 18 d) 28​

2. Which of the following numbers are prime? a) 53 b) 12 c) 18 d) 28