(−8* y^2−9*y)+(8*y^3+9*y^2−2*y)
first, remove extraneous parentheses (or distribute if negative)
=−8* y^2−9*y+8*y^3+9*y^2−2*y
then group terms in decreasing degree of y (variable)
=+8*y^3 −8* y^2+9*y^2 −9*y−2*y
simply expression by adding/subtracting similar terms
=+8*y^3 +y^2 −11*y
to give the final answer.
<span> <span>The perimeter of a rectangle is 102 cm. If the length is 15 cm less than twice the width</span></span>
we are given
The water level in Ricky lake changes at an average of -7/48 inch for 1 year
It means that
In 1 year , the water level changes at
and we have to find the water level change after 5 years
so, we can multiply both sides by 5
In 5*1 year , the water level changes at
In 5 years , the water level changes at
Hence,
the water level change after 5 years is ........Answer
5 is to 7 as is to 49 is to 51