Answer:
7 dm
Step-by-step explanation:
Pour un carré,
aire = (côté)²
(côté)² = 49 dm²
√[(côté)²] = √(49 dm²)
côté = √(49 dm²)
côté = 7 dm
Answer:
about 152
Step-by-step explanation:
138.72-(45.2+18)+75.85=151.37
This equation does not have any solution since determinant <0
i.e.,D=b^2-4ac
=2^2-4×1×7
=4-28
=-24
i.e.,is less than 0
Answer:
$59
Step-by-step explanation:
Let the revenue will be maximum when $ x is increased in the ticket price.
So, the final ticket price is $(18 + x) and attendance in the concert will be (500 - 5x)
So, revenue R = (18 + x) (500 - 5x) = 9000 + 410x - 5x².......... (1)
Condition for R to be maximum is 
So, differentiating equation (1) with respect to x on both sides

⇒ x = 41
So, the ticket price for maximum revenue is $(18 + 41) = $59 (Answer)
They are both similar because you just have to multiply 7 x 2 and then add the zeros. 7 x 20 is 140 and 7 x2000 is 14000