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3 years ago

18. Which of the following groups of numbers are all prime numbers?

Mathematics

1 answer:

Liono4ka [1.6K]3 years ago

6 0

Answer:

Step-by-step explanation:

3,11,23, and 31 can only be divided by 1 without becoming a decimal.

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Which equation could be used to find the length of the hypotenuse?

damaskus [11]

c^ 2 = a^2 + b^2

given a = 2 and b = 5

c^2 = 2^2 + 5^2

2^2 + 5^2 = c^2

answer is the first one

2^2 + 5^2 = c^2

4 0

3 years ago

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A student is assessing the correlation between the number of hours a plant receives sunlight and the height to which it grows. [

BigorU [14]

Answer:

i only understand part A:

a) Yes, the more time the plant spend in sunlight, the taller it grows. for example, the plant that spend no time in the sun only grows to 4cm while the plant that spent 9 hours in the sun grew to 31

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3 years ago

What percent of 140 is equal to 7% of 500

blagie [28]

Answer:

49%

Step-by-step explanation:

7 percent of 500=35%

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3 years ago

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Find the area of an equilateral triangle (regular 3-gon) with the given measurement. 9-inch perimeter A = sq. in.

Alona [7]

Answer:

$3.9 in^2$

Step-by-step explanation:

The area of a triangle is given by

$A=\frac{1}{2}bh$

where

b is the base

h is the height

Here we have an equilateral triangle, which has the 3 sides of the same length.

Let's call L the length of one side.

We know that the perimeter of the triangle is

p = 9 in

The perimeter is the sum of the three sides, so:

$p=L+L+L=3L$

Therefore, we find the length of the side:

$L=\frac{p}{3}=\frac{9}{3}=3 in$

Therefore the length is the base of the triangle,

$b=L$

The height can be calculated by considering half triangle: the hypothenuse is equal to L, while one side is equal to half the base (b/2), therefore the height is given by Pythagorean's theorem:

$h=\sqrt{L^2-(\frac{b}{2})^2}=\sqrt{3^2-(\frac{3}{2})^2}=2.6 in$

Therefore, the area of the triangle is:

$A=\frac{1}{2}(3)(2.6)=3.9 in^2$

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3 years ago

jenny`s mom says she has an hour before it's bedtime. Jenny's spends 3\5 of hour texting a friend and 3\8 of the remaining time

laiz [17]

First you'll need to get the same denominator. So instead of 3/5 and 3/8 you'll have 24/40 and 15/40. Now that we've changed the value of the denominator, the 40/40 will now represents the 1 hour that Jenny has before bedtime. So you add 24/40 and 15/40 and get 39/40. 39/40 stands for the time that Jenny has already spent brushing her teeth and texting her friend all together. Since the 1 hour is 40/40 subtract 39/40 from it to get 1/40. 1/40 is equal to the rest of the time Jenny spends reading or 1.5 minutes.

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3 years ago

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