Answer:
(3r-10) (r+8)
Step-by-step explanation:
3r-34r+80
The first step is to combine like terms
3r - 34r
is -31r
-31r+80
We cannot factor since 31 is a prime number and 80 is not a multiple of 31
If you mean
3r^2-34r+80
(3r-10) (r+8)
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For option d:
5x - 7y = 10 . . . . . (1)
10x - 14y = 8 . . . . (2)
(1) x 2 => 10x - 14y = 20 . . . . . (3)
(2) - (3) => 0 = -14 [not possible]
Therefore, the set of equations in option d, has no solutions.
Rule: For any quadrilateral, the four angles always add to 360 degrees
A+B+C+D = 360
A+95+100+90 = 360 ... plug in the given angles
A+285 = 360
A+285-285 = 360-285 ... subtract 285 from both sides
A = 75
Answer: choice C) 75 degrees
