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3 years ago

Who is right and wrong and why?

Mathematics

2 answers:

sdas [7]3 years ago

6 0

Answer:

BMX Ben is correct and Pizza Pete is wrong

Step-by-step explanation:

For Both equations, we must isolate the x, or move everything to one side. So you'd have to add 25 because you have a negative 25 and a negative number plus a positive version of itself equals 0

x-25=7

+25=25

__________

x=32

The second one is incorrect because you are subtracting negative 25 from a 25, which is -50

Serggg [28]3 years ago

5 0

Ben is right, you must add 25 not subtract it

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1. A luge race is very dangerous, and a crash can cause serious injuries. The league requires anyone who has a crash to have a t

antiseptic1488 [7]

Answer:

0.7061 = 70.61% probability she will have her first crash within the first 30 races she runs this season

Step-by-step explanation:

For each race, there are only two possible outcomes. Either the person has a crash, or the person does not. The probability of having a crash during a race is independent of whether there was a crash in any other race. This means that the binomial probability distribution is used to solve this question.

Binomial probability distribution

The binomial probability is the probability of exactly x successes on n repeated trials, and X can only have two outcomes.

$P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}$

In which $C_{n,x}$ is the number of different combinations of x objects from a set of n elements, given by the following formula.

$C_{n,x} = \frac{n!}{x!(n-x)!}$

And p is the probability of X happening.

A certain performer has an independent .04 probability of a crash in each race.

This means that $p = 0.04$

a) What is the probability she will have her first crash within the first 30 races she runs this season

This is:

$P(X \geq 1) = 1 - P(X = 0)$

When $n = 30$

We have that:

$P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}$

$P(X = 0) = C_{30,0}.(0.04)^{0}.(0.96)^{30} = 0.2939$

$P(X \geq 1) = 1 - P(X = 0) = 1 - 0.2939 = 0.7061$

0.7061 = 70.61% probability she will have her first crash within the first 30 races she runs this season

7 0

2 years ago

Solve the following: 3/4x=1/8 x/5=2.3 x/3.2=4.5

antiseptic1488 [7]

Step-by-step explanation:

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3 years ago

Find the product of 487.9573 and 1,000.

maria [59]

487.9573 * 1000 = 487947.30

As you can see, the first number has a decimal point, and the second number is 1000. You can drop the 0s in the 1000 leaving 1 to multiply with the first number. Simply move the decimal point to the right based on the number of 0s there are on the second number.

Since, 1000 has three 0s. Move the decimal point 3 times to the right of the number. So, from 487.9573 to 487957.3

If the function is division but the numbers are the same, you must move the decimal point to the left.

6 0

3 years ago

Luisas restaurant bill comes to $75.50, and she leaves a 15% tip. Whatis Luisas total restaurant bill?

natali 33 [55]

multiply $75.50 by 0.15(15% in decimal form).then add the amount calculated to $75.50 and you get the final cost

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3 years ago

Remember that you can multiply by the reciprocal of the divisor when you divide by a fraction. find each quotient. simplify if p

QveST [7]

1. 1/6
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3. 1/16
4. 1/16

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3 years ago