Less than 90° = acute
more than 90° = obtuse
equal to 180° = straight
more than 360° = reflex
Answer:

Step-by-step explanation:
Given

Required
Determine the roots
To get the root of the function, then f(b) must be 0;
i.e. f(b) = 0
So, the expression becomes

Add 75 to both sides


Take square roots of both sides


Reorder

Expand 75 as a product of 25 and 3

Split the expression




The options are not clear enough; however the roots of the equation are 
Answer:
10 / 12
simplified:
5/6
since 5 is a prime number, we can't simplify this ratio any further
I think the answer is 2 and -15. Because 2 times - 15 is -30 and 2 and -15 can be added to -1.
The answer is 91 and the property used is the Identity Property of Addition.