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patriot [66]
3 years ago
11

-np-90<30 solve for n

Mathematics
2 answers:
ad-work [718]3 years ago
5 0
-np-90\ \textless \ 30\\\\-np -90 +90\ \textless \  30 + 90\\\\-np \ \textless \  120\\\\\frac{-np}{-p}\ \textless \  \frac{120}{-p}\\\\\boxed{\bf{n \ \textgreater \  -\frac{120}{p}}}

Note: When you divide by a negative answer on both sides, you have to flip the sign.
dimulka [17.4K]3 years ago
3 0
-np - 90 < 30

Add 90 to each side, since we have to do everything on one side so we can solve the unknown variable. 
-np \ \textless \  30 + 90

Simplify/add 30 + 90, which should equal 120.
-np \ \textless \  120

Divide each side by p, which should create a fraction due to the division.
-n \ \textless \   \frac{120}{p}

Our last step is to multiply each side by -1. We got negative 1 since a variable by itself can be considered the number 1, and since it had a negative sign in front of it.
n \ \textgreater \   -\frac{120}{p}

Answer: n \ \textgreater \  - \frac{120}{p}
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A drainage basin bordering the sea has an area of 7500 km2 . The average precipitation for this drainage basin is 900 mm year-1
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4 years ago
PLZPLZPLZ HELP ME!!!
zhannawk [14.2K]
If \ell is the length and w the width, then \ell=2w-2.

Since the area of the rectangle is

\ell w=40

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(2w-2)w=40\implies 2w^2-2w-40=0\implies w^2-w-20=0

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3 years ago
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