(4₊√₋81)₋(9₊√₋9) i cant resolve this equation. thanks for help
2 answers:
Answer:
-5 +6i
Step-by-step explanation:
Square roots of negative numbers are imaginary. This is asking for the difference of two complex numbers. A suitable calculator can show you what that is.
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<h3>simplify radicals</h3>We know that √(-1) ≜ i. This means the radicals can be simplified to ...
So the expression becomes ...
(4 +9i) -(9 +3i)
<h3>combine terms</h3>Like terms can be combined in the usual way. For the purpose here, i can be treated as though it were a variable.
(4 +9i) -(9 +3i) = 4 +9i -9 -3i
= (4 -9) +(9 -3)i
= -5 +6i
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Answer:
B)
Step-by-step explanation:
Given:
Height of cylinder (h) = 10 yd
Diameter of cylinder (d) = 14 yd
We need to find the surface area of the cylinder.
Solution:
First we will find the radius of the cylinder.
Radius is half of the diameter.
radius (r) =
Now we know that;
Surface area of cylinder is equal to 2 times π times radius(r) times sum of radius (r) and height (h).
Framing in equation form we get;
Surface area of cylinder =
Substituting the given values we get;
Surface area of cylinder =
Rounding to nearest tenth we get;
Surface area of cylinder =
Hence the surface Area of cylinder is .