1+sin²x=2-cos²x
Remenber: sin²x+cos²x=1 ⇒sin²x=1-cos²x
1+sin²x=1+(1-cos²x)=2-cos² x (this is true)
Answer:
g = 21/4
Decimal form:
g = 5.25
Mixed Number:
5 1/4
Pemdas if you don't know what they are it looks like this.. (4+5)-5+4
similar to that.....
I am pretty sure you wouldn't add that in a agenda because of the different properties it has but there are plenty more ways i just haven't figured them out
To solve this, set up the equation, 90% of x being .9*x=57. Then, solve for x, x=57/.9=

=6.333
For this case we must solve a system of two equations with two unknowns, given by "x" and "y".
We have:

We multiply (2) by -1:

We add (1) and (3):

Clearing x:

We substitute
in (2)

Thus, the solution of the system is 
Answer:
The solution of the system is 