Answer:
Step-by-step explanation:
So negitive have the - besides it and + mean its negative .
It would be, 5+(-7) = 5-7 = -2
B)Option B is your answer........
Answer:
14
Step-by-step explanation:
Let's say Devaughn is x amount of years old and Sydney is y amount of years old.
Since the sum of their age is equal to 56, you would make the equation:
x+y=56
Now, set that aside and move on to the next step.
They are saying the Devaughn (x) is 3 times the number of years Sydney (y) is. So in mathematical terms you can create an equation stating:
3y=x because 3 times Sydney's age (y) would be Devaughn's age (x).
With the equations:
3y=x
x+y=56
You can plug in x in (x+y=56) as 3y because the other equation is saying that x is equal to 3y. So, that will give you 3y+y=56. Now, combine like terms or just simplify.
Simplifying 3y+y=56 would give you 4y=56, now just divide 56 by the 4 and you will get 14. This is saying that y=14. Now plug in y for the other equation (x+y=56):
x+14=56
Subtract 56 by 14 and it'll give you 42. That is saying x=42.
The question is asking for Sydney's age and i substituted her for the letter y which equaled 14.
Hope this helped :)
49a. r=9 & r=3
49b. r=59048 & r=19683
49c. The first equation subtracts 1 from 3^n while the second equation subtracts 1 from the value of n.
49d. ***I forgot what an exponential function is, sorry...***
CANT FIGURE OUT 50. Hope I helped...
Answer:
She needs 2916 in2. Now in reality bolts of cloth are either 45 or 60 inches. So she may need to buy more cloth than she needs.