Plz help I think I have it right but I am not for sure

Mathematics

1 answer:

Julli [10]2 years ago

8 0

Cost of jeans = 60
total cost of the shirts = 20x

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Please help! ASAP, no bots.

harkovskaia [24]

Answer:

perfect square (4x - 3)^2

Step-by-step explanation:

3 0

3 years ago

2.5+x =81−8.1 find x

aksik [14]

The answer is x=70.4

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2 years ago

A school rents a bus for $90. If 72 students ride on the bus, what is the cost per student?

never [62]

Answer:

C: 1.25

Step-by-step explanation:

because 90/72 = 1.25

8 0

2 years ago

Read 2 more answers

A box contains 5 red and 5 blue marbles. Two marbles are withdrawn randomly. If they are the same color, then you win $1.10; if

topjm [15]

Answer:

a) The expected value is $\frac{-1}{15}$

b) The variance is $\frac{49}{45}$

Step-by-step explanation:

We can assume that both marbles are withdrawn at the same time. We will define the probability as follows

#events of interest/total number of events.

We have 10 marbles in total. The number of different ways in which we can withdrawn 2 marbles out of 10 is $\binom{10}{2}$ .

Consider the case in which we choose two of the same color. That is, out of 5, we pick 2. The different ways of choosing 2 out of 5 is $\binom{5}{2}$ . Since we have 2 colors, we can either choose 2 of them blue or 2 of the red, so the total number of ways of choosing is just the double.

Consider the case in which we choose one of each color. Then, out of 5 we pick 1. So, the total number of ways in which we pick 1 of each color is $\binom{5}{1}\cdot \binom{5}{1}$ . So, we define the following probabilities.