3 years ago

What is the value of x? In a equation

Mathematics

1 answer:

Eddi Din [679]3 years ago

5 0

It could be any number

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What is 2(10) + 2(x – 4) simplified

Digiron [165]

20+2x-8

Answer: 12+2x

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1 year ago

I don't know how to solve this. How would I solve this? Thanks!!!!

Afina-wow [57]

Answer:

x = 11 units

Step-by-step explanation:

Area of triangle = (base + base 2) * h *1/2

so (7 + x )* 7 * 1/2 = 63

63 x 2 = 126

126 / 7 = 18

18-7 = x

x = 11

Check

(7+11)* 7 * 1/2

18* 7 = 126

126 x 0.5 = 63

CORRECT!

(p.s., tell me if wrong :P)

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3 years ago

A tennis tournament has 2n contestants. We want to pair them up for the first round of singles matches. Show that the number of

ddd [48]

There are

$\dbinom{2n}2 = \dfrac{(2n)!}{2! (2n-2)!}$

ways of pairing up any 2 members from the pool of $2n$ contestants. Note that

$(2n)! = 1\times2\times3\times4\times\cdots\times(2n-2)\times(2n-1)\times(2n) = (2n-2)! \times(2n-1) \times(2n)$

so that

$\dbinom{2n}2 = \dfrac{(2n)\times(2n-1)\times(2n-2)!}{2! (2n-2)!} = \boxed{n(2n-1)}$

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2 years ago

530 : 34 =? Write your answer as a whole number and remainder.

Scorpion4ik [409]

168 and 7 as remainder

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3 years ago

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1. What is the place value of the 1 in 1,234,567,890?

FrozenT [24]

Answer:

The place value of 1 in 1,234,567,890 is 1,000,000,000.

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2 years ago

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