Answer: 4 books
Step-by-step explanation:
x = minimum number of book
Leslee
= 3x (bought 3 times the minimum)
Denise
= x + 7 (bought 7 more than the minimum)
Together
= (3x) + (x + 7)
(3x) + (x + 7) = 23 (books they bought together)
3x + x + 7 = 23
3x + x = 23 - 7 (isolate the like variables together)
4x = 16 (divide both sides by 4)
x = 4
4 is the minimum number of books
To check:
3(4) + (4+7)
12 + 11 = 23
Answer:
4h + 100
Step-by-step explanation:
h = total number of hats
postcards = 2h
magnets = h + 100
Add them all together:
h + 2h + h + 100 = 4h +100
Answer:
3. -2
4. 12
5. -4
Step-by-step explanation:
For all problems, let n represent "a number." You will note that when we specify an operation to be done on the equation, it is done to <em>both sides of the equation</em>.
__
3. 5n +(-3) = -13
5n = -10 . . . . . . add 3
n = -2 . . . . . . . . divide by 5
The number is -2.
__
4. (n/2) -7 = -1
n/2 = 6 . . . . . . . add 7
n = 12 . . . . . . . . multiply by 2
The number is 12.
__
5. 2n -1 = -9
2n = -8 . . . . . add 1
n = -4 . . . . . . divide by 2
The number is -4.
Answer: The answer is B
Step-by-step explanation:
After subtracting 8.32 from 15.91, you get 7.59. If you add 8.32 and 7.59 you get back 15.91