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-2, 9

Step-by-step explanation:

Factor this expression:

We know that we need a factorization that multiplies to -18, and adds up to positive 7. Test all our combinations! Add them together and see if they equal 7.

-18 + 1 = -17 ≠ 7

-1 + 18 =  17 ≠ 7

-9 + 2 =  -7 ≠ 7

-2 + 9 = 7

So we need to use -2 and 9!

9.55 degrees.

step-by-step explanation:

the given angle is

1 cycle is equal to 2π radians. so 4π will be equal to two cycles.

5.166667π-4π = 1.166667π

hence, this angle goes a little more than negative x axis.

1.166667π-π= 0.166667π

hence, the reference angle is 0.166667π radians.

1 radian = 57.2958 degrees

now, in degrees, this should be equals to 9.55 degrees.