Answer:
Option D is correct i.e angle B is 55°
Step-by-step explanation:
Given In triangle ABC, a=7, b=10 and angle C is a right angle.
we have to find the angle B.
As given triangle is right angled triangle,
∴ we can apply the formula of trigonometric ratios to find the angle B

⇒ 
Hence, angle B is 55°
Option D is correct.
Which answers have a negative sign and which answers have no negative signs. Put them in the right box that has a negative or no negative sign.
pi r squared, it doesnt let me type out the symbols sorry
X^(3•2) =X^ 6
Think of an example such as :
(2^3)^2=8^2=64 is the same with
2^(3•2) = 2^6 = 64