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natka813 [3]
3 years ago
8

When a number is decreased by 47%, the result is 20. What is the original number to the nearest tenth?

Mathematics
1 answer:
Naily [24]3 years ago
4 0

Answer:

37.7

Step-by-step explanation:

n - 0.47n = 20

0.53n = 20

n = 37.7

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the height of a kicked soccer ball is represented by the function f(x)=8x-2x^2 where x is the number of seconds since the ball w
____ [38]

Answer:

Result at time x = 4 seconds the soccer ball hit the ground.

Step-by-step explanation:

At the moment just before the ball is kicked, it is on the ground and so the height f(x) is zero meters. After the kick, the ball goes through the air and it's path can be described by a (mountain) parabola.

So lets see after how many second (x) the height = 0 once again.

f(x) = 8x-2x^2

f(x) = 0

8x - 2x^2 = 0

Try to write the formula in two terms

-2x * (x - 4) = 0

When a product of two or more terms equals zero, then at least one of the terms must be zero.

Now solve each term = 0 separately, meaning, solve as many equations as there are terms in the product.

Any solution of term = 0 solves product = 0.

Solve the first term:

-2x = 0

Multiply left an right from the = singn with the factor -1 gives this outcome:

2x = 0

x = 0

Solve the second term:

x-4 = 0

x = 4

Result at time x = 4 seconds the soccer ball hit the ground.

x = 4

x = 0

5 0
3 years ago
2 is underlined 12.917 what is the place value for 2
Nadya [2.5K]

Answer: 2 is the nearest whole number.

Step-by-step explanation:

5 0
3 years ago
Read 2 more answers
A paper clip is dropped from the top of a 144‐ft tower, with an initial velocity of 16 ft/sec. Its position function is s(t) = −
BabaBlast [244]
\bf s(t)=-16t^2+144\implies \stackrel{velocity}{\cfrac{ds}{dt}}=-32t

when does it hit the ground?  check the picture below.

\bf 0=-16t^2+144\implies 16t^2=144\implies t^2=\cfrac{144}{16}\implies t^2=9
\\\\\\
t=\sqrt{9}\implies t=3

at that moment, the velocity is -32(3).

7 0
3 years ago
What is the answer??
Dmitriy789 [7]

Answer:

the answer would be the second one

Step-by-step explanation:

a congruency symbol consists of a = and a ~

8 0
2 years ago
Given: 4x - 7 = 2x + 9 Prove: x = 9 What is the missing reason? 1. 4x - 7 = 2x + 9 ------------- 1. Given 2. 2x - 7 = 9 --------
sdas [7]
Lol have fun on thos
4 0
3 years ago
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