Let's make an equation to show how to get how many people were in 105,000.
But, with a decrease, you have to decrease it from 100.
100-12.5
87.5
So it will be 87.5 of what it was previously. Now let's get to the equation.
.875x=105,000
Let's divide each side.
105,000÷.875
120,000
Let's check if this was a 12.5% decrease.
120,000×0.125
15,000
120,000-15,000
105,000
So the population of 2010 was 120,000 people.
Y = -x +8 is the answer for this one.
Answer:
It is 4.
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What you would have to do is distribute your three to each number in the parentheses using multiplication so your answer would be 6y+15
121 is the area of the square