N(2n+6)-(n²-1)= 2n²+6n-n²+1=n²+6n+1
X=3
91 + x^2
91 + 3^2
91 + 9
91 + 9 = 100
Answer:
A≈7238.23
Step-by-step explanation:
A=πr2
Area =π(48)2
Answer:
(-4,9)
Step-by-step explanation:
To solve the system of equations, you want to be able to cancel out one of the variables. In this case, it'd be easiest to cancel out the x variables. To do this, you'll want to multiply everything in the first equation by 2 (2(x-5y=-49)=2x-10y=-98). Then, you can add the two equations together. 2x and -2x will cancel out, so you'll be left with -11y=-99. Next, solve for x by dividing both sides of the equation by -11, which will give you y=9. This is your y-coordinate! At this point, you're halfway to the answer as you just need your x-coordinate. It's not too difficult to find the x-coordinate, since you just substitute 9 into one of the equations. It doesn't matter which one you choose as you should get the same answer with both. I usually substitute the y-value into both equations, though, just to make sure I'm correct. Once you put the y-value into the equations, you should get x=-4 after solving it. :)
6.4
1/2 * 5.4 * 7.1 sin60
Mark brainliest please
