The 2 is in the ten million’s place
When we say Wendy's pay depends on the hours she works, that means pay is the dependent quantity and hours are the independent quantity.
The ordered quadruple
(independent; dependent; hours; pay)
is
(hours worked; weekly pay; 30 to 35 hours; $360 to $420)
this corresponds to the 2nd selection
We have that
<span>50% of A is equal to $0.5a
0.50A=0.5a----------> A=a
and
</span><span>20% of B is equal to $0.2a
0.20B=0.2a---------> B=a
so
A=B
the answer is
A=B</span>
This can be represented as:
Open the bracket:
Collect like terms:
Simplify :
Divide both sides by 2:
You can check the answer by inputting - 2 in the first equation:
Hope I helped you! ☺️
Cos²x+2cos x+1=0
We have to do a change of variable.
cos x=t
Then, we have the next square equation.
t²+2t+1=0
We solve this square equation:
t=[-2⁺₋√(4-4)]/2=-1
if cos x=t then we have that:
cos x=-1
x=cos⁻¹ -1= π radians or 180º.
Answer: x=π (in radians) or x=180º (in degrees).