Answer:15
Step-by-step explanation:
Given
Craftsman sell 10 Jewelry set for $500 each
For each additional set he will decrease the price by $ 25
Suppose he sells n set over 10 set
Earning
Earning 
differentiate to get the maximum value
Equate 
to get maximum value
Thus must sell 5 extra set to maximize its earnings.
Answer:
N and P
Step-by-step explanation:
N and P grab a like and move the ends in a circle around each letter if they look symmetrical at any point that letter has a line of symmetry.
8.4 because 6 would round up to 10 and 10+30 =40 for 8.40 or just 8.4
Answer:
A and C
Step-by-step explanation:
Given
2cos²x - 2 = 0 ( add 2 to both sides )
2cos²x = 2 ( divide both sides by 2 )
cos²x = 1 ( take the square root of both sides )
cos x = ± 
= ± 1
cos x = 1 ⇒ x = 
(1) = 0°
cos x = - 1 ⇒ x = (- 1) = 180°
To subtract a number from another number, they must be the same type. 4 1/4 is a mixed number; 3/4 is a fraction. thus, 4 1/4 must be converted into fractional form go subract a fraction (3/4) from it.
