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olga55 [171]
3 years ago
5

Erik is performing a marble experiment in math class. His teacher places an equal number of black, red, and white marbles in a b

ag. Then, Erik randomly takes out a marble, records the result, and puts the marble back in the bag. Each of the first four times Erik takes out a marble, he gets a black marble. A. What is the theoretical probability of Erik picking a black marble next time
Mathematics
1 answer:
olganol [36]3 years ago
5 0

Answer:

1/3

Step-by-step explanation:

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Carol is building a screen door. The height of the door is one foot more than twice its width. What is the width of the door if
Arte-miy333 [17]
Hello,

A good method for solving this question is creating an equation to solve for the width of the door.

Let w = the width of the door
Let h = the height of the door

The height (h) is twice the width (2w) and one foot more (+1).
We can make the equation h = 2w + 1

Now, we are given that the height of the door is 7 feet, so h = 7.
We can simply plug in 7 for h in the equation to solve for w. 

So, we have h = 2w + 1
7 = 2w + 1
Subtract by 1 on both sides to get:
6 = 2w
Divide by 2 on both sides to get:
w = 3

The width of the door is 3 feet.

However, we should check out answer with the given question to make sure it checks out.

We are given that the height of the door is one foot more than twice its width, and the height of the door is 7 feet.

Twice the width is 6 feet, and one foot more than that is 7 feet. Our answer checks out.

The width of the door is 3 feet.

Hope this helps!

6 0
3 years ago
Brianna has 4 pink bracelets. One third of all her bracelets are pink. How many bracelets does brianna have?
aivan3 [116]
Hey there!

Let's first evaluate this problem, and the keyword we need to use. The problem says that out of the total number of bracelets Brianna has, x, 1/3 of them are pink. The reason the word of is so important throughout math is that it signifies multiplication. For example, 1/2 of 10 is 5 because 1/2 times 10 is 5.

Now, to apply that to this situation, we need to create an equation, a mathematical statement that indicated the equilibrium or equality of two values. Since we have 1/3 of all her bracelets, x is four, we can set up our equation. Here's another good keyword- is. Is signifies an equation, because it means "equal to" mathematically. For example, 5 is equal to 20/4.

We have:

1/3(x) = 4 

(One-third of x, the total amount of bracelets, is four.)

We don't want that fraction there. In order to get rid of it and keep the expression equal, we multiply both sides by 3. We have,

x = 12

Hope this helps!
8 0
3 years ago
Olga has a drawer of socks with 4 red pairs, 2 gray pairs, and 8 black pairs. She also has a
Korvikt [17]

Answer:

2/7, 1/10, 2/15

Step-by-step explanation:

hope this helps!!

7 0
3 years ago
For what values of k does the line y = kx –4 pass through the point of intersection of the lines y=2x–5 and y=–x+1?
statuscvo [17]
Step by step equation
5 0
3 years ago
Help me plss!!!!!!!!!!​
Westkost [7]

Answer:

You just take the product of 0.2 and 0.6. The answer is 0.12 miles.

6 0
3 years ago
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