Nine billion, nine hundred thousand, nine.
Since the first part says the value is five less then twice the square of a negative number we get the first equation as 2(-x)²-5. Then we have that -9x is equal to that previous equation. Therefore our new equation is 2(-x)²-5=-9x. We can move the nine over by adding it to both side to get 2(-x)²+9x-5=0. Then you can use any method of factoring (I prefer quadratic formula) to get your values for x. By doing so, you’ll get x=28 and x=-32.5. Since the problem said the number was negative in the first part, you know you can’t have the 28 as the answer so the right answer is -32.5.
<u>Congruent
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These are angles, segment, triangles etc. that have exactly the same measures.
Let's find the area of the outer circle and the inside circle
the inside's circle area
A= π x 6²=36<span>π
the outer's
A' = </span>π x 4x²= 4<span>πx²
A'-A=4</span>πx²- 36π=160πcm² equivalent to x²- 9=40, so x²=49 implies x =sqrt(49)=7, x=7<span>
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70,000 is in word form not standard form