9514 1404 393
Answer:
- wrong: -2x² -x² ⇒ -2x²
- correct: x³ -3x² +6
Step-by-step explanation:
The point of these "what was done wrong" exercises is to see if you know what the correct steps look like.
On line 2, Danielle correctly distributed the minus sign to eliminate the second set of parentheses. (There is often a problem with minus signs and parentheses, so it is nice to see it done correctly.)
On line 3, the two x² terms are incorrectly combined. It looks as though Danielle simply dropped the -x² term because it disappeared without changing the coefficient of x² from -2x². The correct sum of those terms is ...
-2x² -x² = -3x²
so the correct work on line 3 is ...
x³ -3x² +6
Set up a ratio.
x= unknown portion out of 330
19/110= x/330
cross multiply
110x= 19 * 330
110x= 6270
divide both sides by 110
x= 57
ANSWER: She could expect 57 out of 330 to choose volleyball
Hope this helps! :)
Answer:
x < 16
Step-by-step explanation:
If you have any questions about the way I solved it, don't hesitate to ask ☺
What I do is to add up the hundreds and tens in my mind first:
130 + 90 + 160 = 380
and then add the small change:
7.50 + 2.50 + 2.50 = 12.50
and add it back to the first amount
392.50
Answer: Lucy will Sew 2 dresses
