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Dennis_Churaev [7]
2 years ago
11

20 POINTS PLUS BRAINLIEST ANDWER PLUS MY HOVER HOARD IM V DESPERATE HERE!!! Evaluate the polynomial for x=-2 in the equation -3x

^3+7x^2-7x-1 (simplify your answer)

Mathematics
1 answer:
Nadya [2.5K]2 years ago
4 0

Answer:

65

Step-by-step explanation:

-3x^3 + 7x^2 -7x-1

Let x = -2

-3(-2)^3 +7(-2)^2 -7(-2) -1

According to PEMDAS, Powers first

-3(-8) +7(4) +14 -1

Then multiply

24 +28 +14-1

Then add and subtract

65

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The weight of adults Male beagles are normally distributed, with a mean of 25 pounds and a standard deviation of 4 pounds.
a_sh-v [17]

Answer:

There is a 95.6% chance that the weight will fall within this range.

Step-by-step explanation:

This is because the extremes that are given are roughly two standard deviations from the mean. To be outside of that, there is only 2.2% likelihood to be higher and another 2.2% to be lower. When we subtract these two from 100%, we get our probability.

100% - 2.2% - 2.2% = 95.6%

6 0
3 years ago
A jewelry box contains two gold hoop earrings and two silver hoop earrings. You randomly choose two earrings. What is the probab
Viefleur [7K]

Answer:

2 + 2 = 4 total earrings in the box.

If you put the earring back into the box before taking out the second, it would be 1/2 * 1/2 = 1/4, 25%.

7 0
2 years ago
Read 2 more answers
A game consists of tossing three coins. If all three coins land on heads, then the player wins $75. If all three coins land on t
emmainna [20.7K]

Answer:

On average, a player should expect to win $15.

Step-by-step explanation:

The expected value in an event with outcomes:

x₁, x₂, ..., xₙ

Each with probability:

p₁, ..., pₙ

is given by:

Ev = x₁*p₁ + ... +xₙ*pₙ

In this case we have 3 outcomes:

player wins $75 = x₁

player wins $45 = x₂

player does not win = x₃

Let's find the probabilities of these events.

player wins $75)

Here we must have the 3 coins landing on heads, so there is only one possible outcome to win $75

While the total number of outcomes for tossing 3 coins, is the product between the number of outcomes for each individual event (where the individual events are tossing each individual coin, each one with 2 outcomes)

Then the number total of outcomes is:

C = 2*2*2 = 8

Then the probability of winning $75 is the quotient between the number of outcomes to win (only one) and the total number of outcomes (8)

p₁ = 1/8

Win $45:

This happens if the 3 coins land on tails, so is exactly equal to the case above, and the probability is the same:

p₂ = 1/8

Not wining:

Remember that:

p₁ + p₂ + ... + pₙ = 1

Then for this case, we must have:

p₁ + p₂ + p₃ = 1

1/8 + 1/8 + p₃ = 1

p₃ = 1 - 1/8 - 1/8

p₃ = 6/8

Then the expected value will be:

Ev = $75*1/8 + $45*1/8 + $0*6/8 = $15

On average, a player should expect to win $15.

7 0
2 years ago
solve the eqution 9.95+0.30s=c c is the amount of dollars a website charges for downloading songs s stands ffor number of songs
lutik1710 [3]

9.95 + 0.30s = C

9.95

9.95 + 10.5  = C

C = 20.45

hope this helps!

~LEAN~

5 0
3 years ago
The taxi cost $2.25 for the first mile plus 15 Cents for each additional tenth of a mile. For a 5.2-mile trip, Eric paid $10 and
k0ka [10]
2.25x15= blah blah blah, and boom there is your answer
4 0
2 years ago
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