All categories

3 years ago

Trini's car breaks down on a highway. Trini estimates that she is 20 to 30 miles

Mathematics

1 answer:

katrin [286]3 years ago

3 0

Answer:

About $155

Step-by-step explanation:

You have about 20-30 miles to the repair shop. You also have the $80 initial fee and the $3 every mile (m). You then put in the equation 80+3m. Since it is 20-30 m (miles) put m as 25. Multiply 25 by 3 to get 75. Then add 75+80 to find the answer which s estimated is $155.

You might be interested in

John makes $10.50 per hour. if he works 35 hours this week, what is his gross pay

VMariaS [17]

$10.50 X 35 would give you your answer which would equal $367.5

7 0

4 years ago

Read 2 more answers

Can someone help me find the gradient for this graph

ololo11 [35]

The line passes through points (0,0) and (7,4)

Gradient = (y2-y1)/(x2-x1) = (4-0)/(7-0) = 4/7

4 0

4 years ago

I'm not very good at math

emmasim [6.3K]

Okay so, I am assuming the model is smaller so it would be 0.34m long.

The model has to be 200 times smaller than the actual plane
Divide 68/200 and you get 0.34
Then to check your answer, multiply 0.34 by 200 which is 68 meaning
0.34:68 is equal to 1:200

Assuming the model is bigger (just in case) it would be 13,600m long.

The in this scenario, the model has to be 200 times bigger so it would be 68(200) which is 13,600

Hope this helps

6 0

3 years ago

About 11% of adult Americans are left-handed. Suppose that two people are randomly selected from this

marshall27 [118]

Answer:

a) $P(X=0)=(2C0)(0.11)^0 (1-0.11)^{2-0}=0.7921$

$P(X=1)=(2C1)(0.11)^1 (1-0.11)^{2-1}=0.1958$

$P(X=2)=(2C2)(0.11)^2 (1-0.11)^{2-2}=0.0121$

And then we have our probability distribution like this:

X | 0 | 1 | 2 |

P(X) | 0.7921 | 0.1958 | 0.0121|

b) $P(X \geq 1) = P(X=1)+P(X=2) = 0.1958+0.0121=0.2079$

Step-by-step explanation:

Previous concepts

The binomial distribution is a "DISCRETE probability distribution that summarizes the probability that a value will take one of two independent values under a given set of parameters. The assumptions for the binomial distribution are that there is only one outcome for each trial, each trial has the same probability of success, and each trial is mutually exclusive, or independent of each other".

Let X the random variable of interest, on this case we now that:

$X \sim Binom(n=20, p=0.48)$

The probability mass function for the Binomial distribution is given as:

$P(X)=(nCx)(p)^x (1-p)^{n-x}$

Where (nCx) means combinatory and it's given by this formula:

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

Solution for the problem

Part a

On this case since we select a sample size of n =2 we have the following values for the number of left handed X=0,1,2. We can find the probabilities for each case since we know that p=0.11.

$P(X=0)=(2C0)(0.11)^0 (1-0.11)^{2-0}=0.7921$

$P(X=1)=(2C1)(0.11)^1 (1-0.11)^{2-1}=0.1958$

$P(X=2)=(2C2)(0.11)^2 (1-0.11)^{2-2}=0.0121$

And then we have our probability distribution like this:

X | 0 | 1 | 2 |

P(X) | 0.7921 | 0.1958 | 0.0121|

Part b

For this case we want this probability:

$P(X \geq 1) = P(X=1)+P(X=2) = 0.1958+0.0121=0.2079$

8 0

4 years ago

Together Vondra and Marion have 51 rocks.Marion has 2 times as many rocks as Vondra. How many rocks dose Marion have? How many r

Otrada [13]

Answer:

Marion has 34 rocks and Vondra has 17 rocks

Step-by-step explanation:

1. 51 ÷ 3 = 17

2. Because Marion has 2 times the amount of rocks as Vondra you have do 17 × 2 = 34

3. So, Marion has 34 rocks and Vondra has 17 rocks

3 0

3 years ago