Answer:
Solution given;
Cos (x-
)=
Cos (x-
)=Cos45°
equating corresponding value
(x-
)=45°
x=45°+5/6
x=45.83°
Answer:

Explanation:
Surface_Area_Cube: 2(Length x Width + Height x Length + Height x Width)
<h3 /><h3><u>
Given sides</u>
:</h3>
<h3><u>
Surface Area</u>
:</h3>
- 2(10 x 7.5 + 12 x 10 + 12 x 7.5)
5x+2/5=x-1/10
Convert 2/5 and -1/10 to equal fractions.
2/5= 4/10
5x+4/10= x-1/10
Subtract x on both sides.
4x+4/10= 1/10
Subtract 4/10 on both sides.
4x=-3/10
Divide both sides by 4.
x=-0.075
I hope this helps!
~kaikers
Divide by the coefficient of x.
x = 27/47
A, because negative is not rational