Thirty copies of a textbook weigh a total of 75 lb. What is the weigh of each book?
Answers
Answer: Each book weighs 2.5 pounds.
Step-by-step explanation: 75 divided by 2.5 is 30. Or you could also get the answer by multiplying 30 and 2.5 which it would be 75. So, therefor, the answer is 2.5.
Final answer:
To find the weight of each textbook, we divide the total weight by the number of books. Therefore, each book weighs 2.5 lb.
Explanation:
If thirty copies of a textbook weigh a total of 75 lb, to find the weight of each individual book, we need divide the total weight by the number of books.
Here is a step-by-step explanation of the solution:
- Determine the total weight of the textbooks, which is 75 lb.
- Determine the number of books, which is 30.
- Divide the total weight by the number of books. So, 75 lb ÷ 30 = 2.5 lb.
Therefore, each book weighs 2.5 lb.
Learn more about Weight of textbooks here:
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Answers
certain means 100%
it is very probable that she won't spinn blue, but that is a 7/8 chance, she still can spin blue (also, if by mere luck the spinner happens to stop in the middle of red and blue then it is amazing)
no
y=\frac{1}{4}x-3y = 1 4 x − 3
Group of answer choices
please help me!
A) (5,0.5)
B) (8,-1)
C) (-1,8)
D) (0.5,5)
What is the solution to the system of equations?
y=2x-3.5y = 2 x − 3.5
x-2y=-14x − 2 y = − 14
Group of answer choices
(10.5, 7)
(-7, 3.5)
(7, 10.5)
(3.5, -7)
Answers
Answer:
- (x, y) = (8, -1)
- (x, y) = (7, 10.5)
Step-by-step explanation:
1. You can use the expression for y to substitute into the first equation:
2x +4(1/4x -3) = 12
2x +x -12 = 12 . . . . . . eliminate parentheses
3x = 24 . . . . . . . . . . . add 12; next divide by 3
x = 8 . . . . . matches choice C
__
2. You can use the expression for y to substitute into the second equation:
x -2(2x -3.5) = -14
-3x +7 = -14 . . . . . . eliminate parentheses
21 = 3x . . . . . . . . . . add 3x+14; next divide by 3
7 = x . . . . . matches the third choice
_____
When the answer choices are sufficiently different, you only need to find one value to determine which is the correct choice. (If you want to check your work further, you can substitute the other answer value into the two equations to see if it works.)
Answers
First, distribute the right side.
8*(x + 5) = 8x + 40
Then, we write the whole equation:
8x + 47 = 8x + 40
Looking at it, we can subtract 8x from both sides, so that we're left with:
47 = 40
However, we obviously know that 47 is NOT equal to 40, so there is no solution for this equation.
Answers
We can change the mixed number to a decimal for comparing.
1.4 m > 1.25 m
Darren > Luke
Darren's jump was higher by (1.4-1.25) 0.15 m
Or another way change the decimal to a fraction and the mixed to an improper fraction too.
1.4 =
We need a common denominator to compare
Darren > Luke
By:
Which is also by 0.15 m
Darren jumps higher and by 0.15 m
Answers
9x^(2)-(7x^(2))-2x+21x-6=-12x+1
2x^(2)+31x=7
9x^2 - [7x^2 + 21x - 2x -6] = -12x+1
9x^2 - 7x^2 -19x +6 +12x - 1 = 0
2x^2 - 7x + 5 = 0
(x-1)(2x - 5)=0
there are two answers
1. x = 1
2. x = 5/2 or 2 1/2
you can try and substitute these numbers in to see if they are correct, because they are for me