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3 years ago

Which of the following is a proportion? 3/4=12/15 8/10=6/8 6/9=8/12 4/6=9/12

Mathematics

2 answers:

ad-work [718]3 years ago

6 0

The answer is 6/9 =8/12 i think bro

Vinil7 [7]3 years ago

6 0

<h2>You didn't have to delete it. I tried answering your question in the box, but it didn't work. Our world is already broken because of people with egos like yours. Everyday you are given breathe, and at least you should choose to use that breathe wisely because any second this whole world can be taken away from you. So, all I ask is please be kind.</h2>

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Regina receive a score of 39 out of 52 on a quiz. What percentage did she earn?

Verdich [7]

Answer:

78%

Convert fraction (ratio) 39 / 50 Answer: 78%

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3 years ago

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If the cost of a raffle ticket is $2, which of the following expressions could be used to represent the cost of m tickets? 2m 2

Bingel [31]

It would be 2m because each ticket is 2 dollars and then you have to multiply it by the number of tickets you are buying M

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2 years ago

The table shows four numbers. -34<br>-0.4 0.4

kvv77 [185]

Answer:

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2 years ago

A ball is thrown downward from a cliff. Its position at time t seconds is given by the formula s(t) = 16t2 + 32t, where s is in

Rom4ik [11]

Answer:

It takes 2.8 seconds for the ball to fall 215 ft.

Step-by-step explanation:

We are given a position function s(t) where s stands for the number of feet the ball has fallen, so we have to replace s with the given value of 215 ft and solve for the time t.

Setting up the equation.

The motion equation is given by

$s(t) =16t^2+32t$

We can replace there s = 215 ft to get

$215=16t^2+32t$

Solving for the time t.

From the previous equation we can move all terms in one side to get

$16t^2+32t-215=0$

At this point we can solve for t using quadratic formula.

$t = \cfrac{-b\pm \sqrt{b^2-4ac}}{2a}$

where a, b and c are the coefficients of the quadratic equation

$at^2+bt+c=0$

So we get

$a=16\\b=32\\c=-215$

Replacing on the quadratic formula we get

$t = \cfrac{-32\pm \sqrt{32^2-4(16)(-215)}}{2(16)}$

Using a calculator we get

$t=-4.8 , t = 2.8$

Physically speaking the only result that makes sense is to move forward in time that give us t = 2.8 seconds.

We can conclude that it takes 2.8 seconds for the ball to fall 215 ft.

3 0

3 years ago

The sum of three numbers in <br> g.p. is 21 and the sum of their squares is 189. find the numbers.

sashaice [31]

Let the three gp be a, ar and ar^2
a + ar + ar^2 = 21 => a(1 + r + r^2) = 21 . . . (1)
a^2 + a^2r^2 + a^2r^4 = 189 => a^2(1 + r^2 + r^4) = 189 . . . (2)
squaring (1) gives
a^2(1 + r + r^2)^2 = 441 . . . (3)
(3) ÷ (2) => (1 + r + r^2)^2 / (1 + r^2 + r^4) = 441/189 = 7/3
3(1 + r + r^2)^2 = 7(1 + r^2 + r^4)
3(r^4 + 2r^3 + 3r^2 + 2r + 1) = 7(1 + r^2 + r^4)
3r^4 + 6r^3 + 9r^2 + 6r + 3 = 7 + 7r^2 + 7r^4
4r^4 - 6r^3 - 2r^2 - 6r + 4 = 0
r = 1/2 or r = 2
From (1), a = 21/(1 + r + r^2)
When r = 2:
a = 21/(1 + 2 + 4) = 21/7 = 3
Therefore, the numbers are 3, 6 and 12.

3 0

2 years ago