74.5 add it up 61-7+((7x1)/2)+17=
Answer:
b
Step-by-step explanation:
Answer:
You know that if f(x) = 1/(x²+1) then F(x)=arctan(x).
What is arctan(x) function? It is inverse function of tan(x) in tge range (-π/2, π/2).
So if tan(x) = y then x = arctan(y)
therefore arctan(-1) = -π/4 because tan(-π/4)=-1 and arctan(1)=π/4 because tan(π/4) = 1.
In conclusion:
integral (dx/(x²+1)) from -1 to 1 =
= F(1) - F(-1) = arctan(1) - arctan(-1) =
=π/4-(-π/4)=π/4+π/4 = π/2.
answer B is correct
Answer:
5y+10
Step-by-step explanation:
The best way to rewrite this equation is to use the distributive property.
5y+10
Or, we can just use the commutative property to switch the numbers around, but I recommend the distributive.
5(2+y)
Hope this helps!
