Answer:

Step-by-step explanation:
So we have the expression:

Distribute. Multiply (4x+5) to each term:

Distribute:

Combine like terms:

Add and simplify:

And this is in descending order, so it's in standard form.
Answer: her new total is $14.40
And she saved $3.60
Step-by-step explanation:
The volume of the triangular prism = 
Thus the volume is
.
Thus the volume is 42 cubic km.
Hope that helps!
Answer:
Step-by-step explanation:
(2/5)x + 9 = 9 is equivalent to (2/5)x = 0
"Nine more than two-fifths of a number is nine" is correct.
Answer:
{y,x} = {17/2,-11}
Step-by-step explanation: