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2 years ago

51 less than the 8 times an unknown number is equal to 53.

Mathematics

1 answer:

Anton [14]2 years ago

8 0

Let, Unknown number = x

8x-51 = 53

8x = 53+51

x = 104/8

x = 13

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Anastaziya [24]

Answer:

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the circular ripple caused by dropping a stone in a pond is increasing in area at a constant rate of 20 square meters per second

mojhsa [17]

Answer:

2/π ≈ 0.637 m/s

Step-by-step explanation:

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2 years ago

three friends are in the same algebra class. Their scores on a recent test are three consecutive odd intergers whose sum is 279.

jasenka [17]

X= 1st integer
x+2= 2nd integer
x+4= 3rd integer

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combine like terms
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subtract 6 from both sides
3x= 273
divide both sides by 3
x= 91 first integer

Substitute x=91 to find 2nd & 3rd integers

2nd Integer
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3rd Integer
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ANSWER: The three test scores are 91, 93 and 95.

Hope this helps! :)

7 0

2 years ago

Choose the best reason for using the median as the measure of central tendency.

Alchen [17]

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2 years ago

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AleksAgata [21]

Combination = doesn't matter what order
Permutation = order matters

There are <u>two</u> methods to work out combinations.

Method 1 List out possibilities
123 124 125 126 127 134 135 136 137 145 146 147 156 157 167
234 235 236 237 245 246 247 256 257 267
345 346 347 356 357 367
456 457 467
567

For a total of 35 combinations.

Method 2 Use a formula.
It's a rather complicated one, so only use it if you have a lot of possibilities.

$\frac{n!}{r!(n-r)!} = \frac{7!}{3!(7-3)!} = \frac{7!}{3!*4!} = \frac{7*6*5*4*3*2*1}{3*2*1*4*3*2*1} = \frac{7*6*5}{3*2*1}=\frac{210}6=35$

(n is the number of choices, r is the amount you choose, and ! is a function that multiplies together all numbers down to 1)

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3 years ago