Answer:
Step-by-step explanation:
- (y+9) = 10
Multiply through by -1 gives us
y+9 = -10
Subtract 9 from both sides
y = -19
That's your answer.
If you work it through it satisfies the equation.
That is:
- (-19 +9) = 10
-(-10) = 10
10 = 10
Boo ya!
Answer:
and 
Step-by-step explanation:


Required
y, when they are equal.
To do this, we set them to another

Square both sides

Expand

Collect like terms


Using quadratic formula
and 
So an easier way to look at this is to think of the decimals as percentages, to convert these decimals to percentages we can multiply each by 100.
Which gives us 58% of students with fruit, and 36% students with crackers. We know that 58% is much larger than 36%, so more students bring fruit instead of crackers.
Because 10 times 10 = 100 and theres 10 rows of 10 so one row is 10 and colom in tenths is 10