Answer:
Helppppppppppp meeeeeee
Step-by-step explanation:
Answer:

Step-by-step explanation:
<u>Given </u><u>:</u><u>-</u>
- A quadratic equation is given to us.
- The equation is 9x² + 30x + c .
And we need to find out the value of c for which the given trinomial is a perfect square. On looking at the given expression all the terms are having positive signs before them .So we can rewrite it on the basis of ,
<u>Identity</u><u> </u><u>:</u><u>-</u><u> </u>
Let's try to set the equation on this Identity .
The firsr term is 9x² . We can write it as ,
Hence the middle term here should contain 3 and 2 as their factors. Let's Break the middle term .

Therefore in order to make the whole expression as perfect square 5² must be replaced by c . The expression would become ,
<u>Hence </u><u>the </u><u>value </u><u>of </u><u>c </u><u>should</u><u> be</u><u> </u><u>2</u><u>5</u><u> </u><u>.</u>
Answer:
The construction of a wind turbine costs around 1.3 to 2.2 MILLION dollars, Most of the commercial-scale turbines installed today are 2 MW in size and cost roughly $3-$4 million installed. Depending on the individual terms of the Power Purchase Agreement, the average wind farmer can make $3,000 to $8,000 per year for the electricity that is produced by each turbine. This amount can be increased to upwards of $10,000 for larger utility-scale turbines with a capacity of two megawatts or more. So it would take around 400 years to just pay OFF a wind turbine if it costs 4 million and the farmer made 10000.
Step-by-step explanation:
Electrical energy to sound energy, or chemical energy
9.60 times 10 squared is the answer