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ad-work [718]
4 years ago
11

Twice a number x,minus 19

Mathematics
1 answer:
Alex4 years ago
6 0

Answer:

2x - 19

Step-by-step explanation:

"Twice a number x" means the (missing) number is called x. Write "2x" which means multiply "x" by 2.

"Minus 19" is -19.

Together, the expression is 2x - 19.

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An experiment involves 17 participants. From these, a group of 3 participants is to be tested under a special condition. How man
lakkis [162]

Answer: 680

Step-by-step explanation:

When order doesn't matter,then the number of combinations of choosing r things out of n = ^nC_r=\dfrac{n!}{r!(n-r)!}

Given: Total participants = 17

From these, a group of 3 participants is to be tested under a special condition.

Number of groups of 3 participants chosen = ^{17}C_3=\dfrac{17!}{3!(17-3)!}\

^{17}C_3=\dfrac{17!}{3!(17-3)!}\\\\=\dfrac{17\times16\times15\times14!}{3\times2\times14!}\\\\=680

Hence, there are 680 groups of 3 participants can  be chosen,.

8 0
4 years ago
3.) If 24 is a multiple of x, and x > 2, which of
astraxan [27]

Step-by-step explanation:

The answer to your question is (D) 16. This is the answer because if count by 16's it goes 16, 24, 36, etc. since 24 is a multiple its could also be x

8 0
3 years ago
Read 2 more answers
How do I solve this algebra two btw
pychu [463]

\bf \begin{cases} x^2+y^2=400\\ \boxed{y}=x-28 \end{cases}\qquad \stackrel{\textit{substituting on the 1st equation}}{x^2+\left( \boxed{x-28} \right)^2=400} \\\\\\ x^2+(x^2-56x+28^2)=400\implies x^2+x^2-56x+28^2=400 \\\\\\ 2x^2-56x+784=400\implies 2x^2-56x+384=0 \\\\\\ 2(x^2-28x+192)=0\implies x^2-28x+192=0 \\\\\\ (x-16)(x-12)=0\implies x = \begin{cases} 16\\ 12 \end{cases}

now that we know what are the x-values, what are the y-values? well, we can just use the 2nd equation, since we know that y = x - 28, then

\bf y = x - 28\implies \stackrel{\textit{when x = 16}}{y = 16 - 28}\implies y = -12 \\\\\\ y = x - 28\implies \stackrel{\textit{when x = 12}}{y = 12 - 28}\implies y = -16 \\\\[-0.35em] \rule{34em}{0.25pt}\\\\ ~\hfill (\stackrel{x}{16}~~,~~\stackrel{y}{-12})\qquad,\qquad (\stackrel{x}{12}~~,~~\stackrel{y}{-16})~\hfill

7 0
3 years ago
There are three samples A, B, and C. Sample A indicates 50 successes out of 120 cases, sample B indicates 80 successes out of 12
san4es73 [151]

Answer:

Step-by-step explanation:

From given information

P_{A} = 50 /120 =  0.4166667

P_{B} = 80 /120 =  0.6666667

P_{C} =48/120 = 0.4

Ha : p > 0.4

Correct order is

Answer : C) B ,A ,C

5 0
3 years ago
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Two students that are on the same longitudinal line are approximately 5400 miles apart. The used an inclinometer, a little geome
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Answer:

MB= 239627

MA= 239327

Radius= 3963

Step-by-step explanation:

7 0
3 years ago
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