3 years ago

Solve this system of equations using substitution y=2x+6 2x-y=2

Mathematics

1 answer:

Dahasolnce [82]3 years ago

4 0

Answer:

No Solution.

Step-by-step explanation:

y=2x+6

2x-y=2

--------------

2x-(2x+6)=2

2x-2x-6=2

-6=2

no solution

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If you flip a fair coin 7 times, what is the probability that you will get exactly 4 tails?

andre [41]

Probability that you will get exactly 4 tails, if you flip a fair coin 7 times is: $\frac{35}{128}$

Step-by-step explanation:

We need to find the probability that you will get exactly 4 tails, if you flip a fair coin 7 times.

This is the combination question.

The total combinations will be: 2^7=128

Now, finding number of ways we can get exactly 4 tiles:

We will use the formula:

$^nC_k=\frac{n!}{k!(n-k)!}$

in our given question, n= 7, k= 4

Putting values:

$^nC_k=\frac{n!}{k!(n-k)!}\\^7C_4=\frac{7!}{4!*3!}\\ ^7C_4=\frac{7*6*5*4!}{4!*3!}\\ ^7C_4=\frac{7*6*5}{6}\\ ^7C_4=35$

So, Probability that you will get exactly 4 tails, if you flip a fair coin 7 times is: $\frac{35}{128}$

Keywords: Probability

Learn more about Probability at:

#learnwithBrainly

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2 years ago

Libby earns $10 each hour for babysitting. Let m = the money she earns, and t = the time in hours she is babysitting. What equat

elena55 [62]

Answer:

$10t=m

Step-by-step explanation:

If for each hour is $10.

She would earn the number of hours times $10.

Example: She did babysitting for 4 hours this weekend. The equation is $10(4)=m or $10 x 4 = m. m=40

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2 years ago

In Davidson Corporation, the first shift produced 8½ times as many lightbulbs as the second shift. If the total lightbulbs produ

Diano4ka-milaya [45]

8 1/2=17/2=8.5

24,700 divided by 8.5=2,905,8823

24,700:17/2 =24,700x2/17=2,905,8823

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3 years ago

13 POINTS! EVALUATE AND SHOW ALL WORK

padilas [110]

Answer:

Step-by-step explanation:

<u>Solving in steps</u>

3| 4.5 - 2| - 5 |-1.5 -(- 3)| =
3 |2.5| -5 |-1.5 + 3| =
3*2.5 - 5|1.5| =
7.5 - 5*1.5 =
7.5 - 7.5=
0

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3 years ago

Decrease 680 by 25% ????????????

pashok25 [27]

25÷100=0.25 0.25×680=170 is the answer

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3 years ago

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