Complete each expression showing all steps, and simplify the final answer to lowest terms (improper fractions do not need to be
changed to mixed numbers as in grade 9, we work with improper fractions instead).
1 answer:
Answer:
a. 
b. 
Step-by-step explanation:
The image below shows step-by-step using Order of Operations (PEMDAS) to solve both of them.
Hope this helps my friend! :)
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Answer:
180
Step-by-step explanation:
Answer:
x=-5, y=-2. (-5, -2).
Step-by-step explanation:
x-3y=1
-x+6y=-7
----------------
3y=-6
y=-6/3
y=-2
x-3(-2)=1
x+6=1
x=1-6
x=-5
Answer:
2
Step-by-step explanation:
9. 4- 2(8) = -12
55-40 = 15
so C is true
8. B
3 and 6 i dont know . seems : 4 . C & D are both correct
6 . All correct
21)
![\bf 8cos^2(\theta )-3cos(\theta )=0\implies \stackrel{common~factor}{cos(\theta )}[8cos(\theta )-3]=0\\\\ -------------------------------\\\\ cos(\theta )=0\implies \measuredangle \theta =cos^{-1}(0)\implies \measuredangle \theta =90^o\\\\ -------------------------------\\\\ 8cos(\theta )-3=0\implies 8cos(\theta )=3\implies cos(\theta )=\cfrac{3}{8} \\\\\\ \measuredangle \theta =cos^{-1}\left( \cfrac{3}{8}\right)](https://tex.z-dn.net/?f=%5Cbf%208cos%5E2%28%5Ctheta%20%29-3cos%28%5Ctheta%20%29%3D0%5Cimplies%20%5Cstackrel%7Bcommon~factor%7D%7Bcos%28%5Ctheta%20%29%7D%5B8cos%28%5Ctheta%20%29-3%5D%3D0%5C%5C%5C%5C%0A-------------------------------%5C%5C%5C%5C%0Acos%28%5Ctheta%20%29%3D0%5Cimplies%20%5Cmeasuredangle%20%5Ctheta%20%3Dcos%5E%7B-1%7D%280%29%5Cimplies%20%5Cmeasuredangle%20%5Ctheta%20%3D90%5Eo%5C%5C%5C%5C%0A-------------------------------%5C%5C%5C%5C%0A8cos%28%5Ctheta%20%29-3%3D0%5Cimplies%208cos%28%5Ctheta%20%29%3D3%5Cimplies%20cos%28%5Ctheta%20%29%3D%5Ccfrac%7B3%7D%7B8%7D%0A%5C%5C%5C%5C%5C%5C%0A%5Cmeasuredangle%20%5Ctheta%20%3Dcos%5E%7B-1%7D%5Cleft%28%20%20%5Ccfrac%7B3%7D%7B8%7D%5Cright%29)
22)
