12×10+15y=390
120+15y=390
15y=270
y=18
So 18 adult t-shirts were sold
Answer:
14.3 feet
Step-by-step explanation:
Let the height of the tree = x feet.
It is given that the horizontal distance from the base of tree = 10 feet and the angle of elevation to the nest is 55°.
So, we get the following figure.
As, we are obtaining a right angled triangle.
Using the trigonometric form for the angles of a right angled triangle, we get,

i.e. 
i.e. 
i.e. 
i.e. 
Hence, the height of the tree is 14.3 feet.
Answer:
when she sold 10 cards, it will cover all her cost.
Step-by-step explanation:
Profit(without charge of booth)=5x-2x
Profit=3x-30
Calculating:
3x=30
x=10
Answer:
-6
Step-by-step explanation:
I got -6, because -11 + 9 is -2 and -2 - 4 is -6. Hope this helped! If you are still confused, please comment so I can help you!