Answer:
B.
Step-by-step explanation:
The negative of a negative is a positive, so B is your choice. Think of it anothe way, if it helps. Imagine that the expression is this:
(-2) + (-1)(-3) since every subtraction problem can be rewritten as an addition problem.
We would first, by orders of operation, multiply the -1 and the -3 getting 3. Then the problem would simplify down to -2 + 3
Just another idea to ponder...
Answer:
0.23
Step-by-step explanation:
300/250 = 6/5
1/5 = 20%
You are correct, well done.
Answer:
10/24 and 15/36, more answers possible
Step-by-step explanation:
if you multiply both the numerator and denominator by the same number, it will always be equivalent to 5/12, as you can simplify it back to that fraction.
5/12, multiply both by two, and you have 10/24
5/12, multiply both by three, and you have 15/36
So he bought 12 CDs and DVDs (in total), CDs + DVDs = 12
Each cd is 2 and each cd is 3
Total spent = 31 (2*x + 3*y)
I call x cds and y dvds
x+y = 12
2x+3y = 31
Solve for y
Move x to the right with changed sign
y = 12-x (DVDs, you can also write x = 12-y)
And substitute 12-y in the equation
2x + 3(12-x) = 31
2x + 36 - 3x = 31
2x - 3x = 31 - 36
-x = -5
x = 5 (CDs)
To find DVDs let's rewrite y = 12-x
y = 12-5 = 7 (DVDs)
