What is a variable?a.
A variable is an unknown number or value represented by a letter
c.
A variable represents a change in value
b.
A variable always represents the total amount
d.
A variable is always represented by the letter x
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There are 50 boxes of books in the storeroom. Each box has 50 books. How many books are there in all?
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Final answer:
To determine the length and width of a rectangle, we can set up an equation using the given information and solve for the variables. By substituting the width back into the equation for the length, we find that the width is 9 meters and the length is 13 meters.
Explanation:
To solve this problem, we can start by using the given information to create equations. Let's assume that the width of the rectangle is 'w' meters. According to the problem, the length of the rectangle is 5 meters or less than twice the width, so the length can be represented as 2w - 5 meters.
The formula to calculate the perimeter of a rectangle is 2l + 2w, where 'l' is the length and 'w' is the width. We are given that the perimeter is 44 meters, so we can set up the equation as follows:
2(2w - 5) + 2w = 44
Simplifying the equation, we get:
4w - 10 + 2w = 44
Combining like terms, we have:
6w - 10 = 44
Next, we can isolate the variable by adding 10 to both sides:
6w = 54
Finally dividing both sides by 6, we find that:
w = 9
Therefore, the width of the rectangle is 9 meters. Substituting this value back into the equation for the length, we find:
l = 2w - 5 = 2(9) - 5 = 18 - 5 = 13 meters.
Learn more about Solving for the length and width of a rectangle here:
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(b.) Reginaldo had $17 in his account and for every book he buys, it costs him $4.
(c.) Sydney has collected 8 postcards. Each time a friend comes to visit, Sydney gives her a postcard.
(d.) Owen has 3 pets. He receives a new pet each time he has a birthday.
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The key to this question is "What do you start with?" All of them (except D) start with something and then a condition reduces the starting point.
A
The condition (at zero) starts with 50 gallons. Every 2 minutes the amount taken away is 2 gallons.
The equation looks like this
y = -2x + 50
So what do you start with? You started with 50 gallons. That's your y intercept. It's big. A is NOT the answer.
B
Renaldo starts with 17 dollars. He hasn't done anything, and he still has 17 dollars. If he buys a book, he has 4 dollars less. So his equation is
y = -4x + 17. The y intercept is 17 if he has bought no books. The answer is NOT B
C
Sydney starts with 8 postcards. Every time a friend comes, Sydney has 1 less post card. Her equation is
y = 8 - x That's not the answer either.
D
What do you start with? 3 pets, correct? Every birthday Owen get's one more. But the starting point is three. So his equation is
y= 3 + x where x is the number of birthdays.
D has the lowest starting point.
D <<<< Answer
plays. Which method finds the total yards at the end of the first four plays?
O add-12 to 3x5
O add 12 to 3x5
O add-12, 5, and 3
O add 12, 5, and 3
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Answer:
Its the first one
Step-by-step explanation:
losing yards means negative... and then its multiplying 3 and 5
Answer:
It is the first 1
Step-by-step explanation:
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8+h>2+3h
==>-2h>2-8
==>-2h>-6
==>h<3
Answer C
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Answer:
9 - ( 2 ÷ x )
Step-by-step explanation: