A ball falls, rebounds to 72% of its previous height and falls again. After two bounces, the ball reached a height of 25cm. From what height was the ball dropped originally?

Answers

Answer 1

Answer: Max Height after first bounce = 25/0.72 = 34.72cm
Original Height from which the ball was dropped = 34.72/0.72 = 48.22 cm (2 decimal places)

Answer 2

Answer: 48.2
25/72=.3472×100=34.72/72=.4822×100=48.2

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Write this phrase as a numerical expression

Answers

Subtract of 11 from 20: 20 - 11

The sum of 4 and 9: 4 + 9

Subtract of 11 from 20, then add the sum of 4 and 9:

(20 - 11) + (4 + 9) = 9 + 13 = 22

A gold coin weigh 20 grams. If the coin contains gold,copper and tin and in the ratio 4:3:1 how much gold is there in the coin ? Explain ???????

Answers

If gold coin weigh 20 grams. If the coin contains gold,copper and tin and in the ratio 4:3:1 then 10gm of gold is present in coin.

What is Ratio?

A ratio is an ordered pair of numbers a and b, written a / b where b does not equal 0.

Given,

A gold coin weigh 20 grams

the coin contains gold, copper and tin and in the ratio 4:3:1

We need to find the amount of gold in the coin.

Now let us add the ratio.

4x+3x+x=20

8x=20

Divide both sides by 8.

x=2.5

The amount of gold in coin is 4x.

4(2.5)=10 gm

Hence, 10 gm of gold is present in 20 grams of coin.

To learn more on Ratios click:

brainly.com/question/1504221

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4 + 3 + 1 = 8
20 ÷ 8 = 2.5

since the ratio is 4:3:1 and gold being 4
4 × 2.5 =

10
10 grams

When working with rational expressions, restricted values are values of your variable that results in an undefined rational expression. Given the following rational expressions: 2x+4/x^2−x−6 and 2/x−3 Determine whether the rational expressions are equivalent and explain your answer. Determine the values that would make the rational expressions undefined. Are these values the same or different? Explain.

Answers

Answer:

See below

Step-by-step explanation:

2x+4 / x^2-x-6

= 2(x+2)/(x-3)(x+2)

= 2/(x-3)

So the 2 expressions are equivalent

The values of x which make the expressions undefined are those values which make the denominators 0

For 2x+4/ x^2-x-6 they are X=3 and x= -2.

For 2/x-3 they are x =3.

How do I find the answer to this order of operations question?
9-3x2+9x8-10/2=

Answers

9-(3x2)+(9x8)-(10/2)=70

If y = x^3 - 1, find the value of y when x = 2.

Answers

y = x³-1

y = 2³ -1

y = 8 -1

y = 7

4.35 divided by 5? does anyone know??????

Answers

.87 is correct you can always check your work with an online calculator. :)

Answer:

0.87

Step-by-step explanation:

I got it right UwU

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