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3 years ago

How do you get 100 using 1,2,3,4,5,6,7,8,9?

Mathematics

1 answer:

AfilCa [17]3 years ago

8 0

Answer: One possible way: 123 - 45 - 67 + 89

Step-by-step explanation: The goal is to get 100, using all of the following numbers: (1,2,3,4,5,6,7,8,9)

We can merge numbers to get 100.

123 - 45 - 67 + 89 (We used every number once)

Lets solve from left to right.

123 - 45 = 78. 78 - 67 = 11. 11 + 89 = 100.

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If the diffrence in the side lenghts of two squares is 10,and the sum of the side lenghts is 18, what are the side lengths

konstantin123 [22]

Answer:

The side of first square =14 units

side of second square =4 units

Step-by-step explanation:

We have given two squares,

A square have all its four sides equal and at right angles.

Let the side of first square be 'a'

and the side of second square be 'b'

Given:

$a-b=10$ equation:1

$a+b=18$ equation:2

Solving equation:1

a=10+b equation:3

Putting 'a' in equation:2

$(10+b)+b=18\\\\2b=18-10\\\\2b=8\\\\b=4$

Putting 'b' in equation:3

$a=10+4\\\\a=14$

So, the side of first square is 14 units and

side of second square is 4 units

5 0

2 years ago

The quadratic model f(x)=-5x^2 +200 represents the approximate height, in meters, of a ball x seconds after being dropped. The b

mel-nik [20]

Answer:

Third option: 5.48

Step-by-step explanation:

Given the quadratic model that represents the approximate height in meters of the ball $f(x)=-5x^2 +200$ . the time in seconds x, when the ball is 50 meters from the ground can be calculated by substituting $f(x)=50$ and solving for x.

Then:

$50=-5x^2 +200$

Subtract 200 from both sides:

$-200+50=-5x^2 +200-200\\-150=-5x^2$

Divide both sides by -5:

$\frac{-150}{-5}=\frac{-5x^2}{-5}\\30=x^2$

Apply square root to both sides:

$\sqrt{30}=\sqrt{x^2}\\\sqrt{30}=x\\5.48=x$

The ball is 50 meters from the ground after about 5.48 seconds.

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3 years ago

7 Find mzx. X (2x + 22)° (9x – 15) Z Y (4x + 11) W

kakasveta [241]

Answer:

Step-by-step explanation:

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2 years ago

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Sin+cos=90
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3 years ago

The sum of three consecutive natural numbers is 540, find the numbers.

vladimir1956 [14]

Answer:

179, 180, 181

Step-by-step explanation:

a +a +1 +a +2 =540

3a +3 =540

3a =540 - 3

3a=537

a=537 :3

a=179 (the first number

b=179 +1 =180 (the second number

c=179 +2 =181 (the third number

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3 years ago