Answer:
and 
the mistake was in calculating 
let's solve first.
Step-by-step explanation:
if 
, substitute the 
in the equation
as
solve the equation in parentheses :
multiply 
by 
it will equal to: 
now we want to let all unknown digits alone, so we will take 
to the other side with a different sign it will be as:
now we will solve it:
at this part, the given equation was wrong in the paper.
we don't want the digit to be negative so we will do it like this:
now that we found 
we will substitute it to find 
:
overall the mistake was in calculating instead of putting
he/she put a different sign in front of the digit like :
so when he/she flipped 
it became positive and instead of subtracting he/she added it.
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The formula for the light bend would be n1*sin i= n2 * sin r
If you use "sin (90-x)= cos x" principle, you can change the sin in the equation into
n1*sin i= n2 * sin r
n1 * cos a= n2 * cos b
n2/n1= cos a/ cos b
Assuming the n constant is the ratio of the glass compared to water then the answer would be: cos a/ cos b
What multiplies to 25 and adds to -10
-5 and -5
(x-5)(x-5)
(x-5)²
