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lesantik [10]
3 years ago
9

Write an equation of a line in point-slope form that has a slope of -2 and passes through (5, -1). A. y + 1 = -2(x – 5) B. y – 1

= -2(x – 5) C. y – 5 = -2(x + 1) D. y -5 = -2(x – 1)
Mathematics
1 answer:
Dmitry [639]3 years ago
8 0
The answer is letter a
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What is the value of x? <br> (x + 40)° (3x)°<br><br> A. 20<br> B.35 <br> C. 60<br> D. 70
Olenka [21]
Hello!

We are given the equation below.

x+40=3x

We want to get all of the variables on side. First of all let's subtract 40 from both sides.

x=3x-40

Now we rearrange our equation so the commutative property will work.

x=3x+(-40)
x=-40+3x

Now we subtract 3x from both sides.

-2x=-40

We divide both sides by -2.

x=20

Our answer is A) 20.

I hope this helps!
4 0
3 years ago
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6-2n is greater than or equal to one half n
alexandr402 [8]

Answer:

n \leqslant 2.4

Step-by-step explanation:

6 - 2n \geqslant  \frac{1}{2} n

Subtract 6 from both sides:.

- 2n \geqslant  \frac{1}{2} n - 6

Subtract 1/2n from both sides:

- 2 \frac{1}{2} n  \geqslant  6

2 \frac{1}{2} n \leqslant 6

Multiply 2 on both sides:

5n \leqslant 12

Divide both sides by 5

n \leqslant 2.4

4 0
4 years ago
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What is the value of x?
Tom [10]
10x - 20 + 6x + 8 = 180
16x - 12 = 180
16x = 192
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4 0
4 years ago
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You have a friend who claims to psychic. You don't believe this so you test your friend by flipping a coin 20 times and having h
Andre45 [30]

Answer:

Given that your friend in not really psychic, he has a probability of P=1.5% of guessing right 15 out of 20 coin flips.

Step-by-step explanation:

We have a binomial distribution problem.

We have to calculate the probability of correctly guessing 15 out of 20 flips of a coin (probability of success for every trial: p=0.5).

We can calculate that with the binomial distribution formula:

P(x)=\frac{n!}{x!(n-x)!}p^x(1-p)^{n-x} \\\\P(15)=\frac{20!}{15!*5!}0.5^{15}*0.5^5\\\\P(15)=15504*0.5^{20}=15504* 0.00000095367 = 0.015

Then we can conclude that, given that your friend in not really psychic, it has only 1.5% of guessing right 15 out of 20 coin flips.

8 0
4 years ago
2.5 yards of a polar fence cost $26. how much does one yard cost?
zheka24 [161]
The answer is 10.4 because 10 goes into 26 1 time so it will leave you with a decimal
5 0
4 years ago
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