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3 years ago

Evaluate x + 4x when x = 20.

Mathematics

1 answer:

Maru [420]3 years ago

6 0

Answer:

Step-by-step explanation:

20+4(20) 20+80 = 100

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How many 5-member chess teams can be chosen from 15 interested players? Consider only the members selected, not their board posi

ryzh [129]

Answer:

3003 number of 5-member chess teams can be chosen from 15 interested players.

Step-by-step explanation:

Given:

Number of the interested players = 15

To Find:

Number of 5-member chess teams that can be chosen = ?

Solution:

Combinations are a way to calculate the total outcomes of an event where order of the outcomes does not matter. To calculate combinations, we will use the formula $nCr = \frac{n!}{r!(n - r)!}$

where

n represents the total number of items,

r represents the number of items being chosen at a time.

Now we have n = 15 and r = 5

Substituting the values,

$15C_5 = \frac{15!}{5!(15- 5)!}$

$15C_5 = \frac{15!}{5!(10)!}$

$15C_5 = \frac{15\times \times 14 \times 13 \times 12 \times 11 \times 10 \times 9 \times 8 \times 7 \times 6 \times 5 \times 4 \times 3 \times 2 \times 1 }{5 \times 4 \times 3 \times 2 \times 1(10 \times 9 \times 8 \times 7 \times 6 \times 5 \times 4 \times 3 \times 2 \times 1)}$

$15C_5 = \frac{15\times \times 14 \times 13 \times 12 \times 11}{(5 \times 4 \times 3 \times 2 \times 1)}$

$15C_5 = \frac{360360}{120}$

$15C_5 = 3003$

7 0

3 years ago

Find the area of an equilateral triangle that has perimeter of 24 m.

mafiozo [28]

we know the perimeter is 24, and is an equilateral triangle, so it has three equal sides, so each side is 24 ÷ 3 = 8.

$\bf \textit{area of an equilateral triangle}\\\\ A=\cfrac{s^2\sqrt{3}}{4}~~ \begin{cases} s=side's\\ \qquad length\\ \cline{1-1} s = 8 \end{cases}\implies A=\cfrac{8^2\sqrt{3}}{4}\\\\\\ A=16\sqrt{3}\implies A\approx 24.71$

6 0

3 years ago

\frac{(2_1-4_{2}) ^{4} } {2} I will give you brainliest

fenix001 [56]

Answer:

I think the answer is 8

Step-by-step explanation:

8 0

3 years ago

PLEASE HELP!! DUE IN AN HOUR!!!

nalin [4]

Answer:

log 27 = 1.43

log 21 = 1.32

109/75 = 1.45

100-128 = -28

6 0

3 years ago

Solve the following equation. Only enter the numeric answer (no variables). 30=2.5(10-2x)

yKpoI14uk [10]

Answer:

x = -1

Step-by-step explanation:

30 = 2.5(10)(-2x) - you multiply by each

30 = 25 - 5x - then pass 25 to the other side and subract

5x = - 5x - then divide 5 / -5

x = -1 - and you have the answer

7 0

3 years ago

Read 2 more answers