Answer: [C]: "Each circle has only one diameter."
________________________________________________________
The answer to your problem is -2.1.
1500
600 per hour
It starts at 1500 and then after one hour
It go up to 2,100 then 2700
<em>(-4)³ = (-4)(-4)(-4) = 16(-4) = - 64</em>
<em>(-7)² = (-7)(-7) = 49</em>
<em>(-)×(-) = +</em>
<em>(-)×(+) = -</em>
