The equation is:
12.99 + 2.10b = 21.39
Subtract 12.99 from each side to get:
2.10b = 8.4
Then divide to find the amount of bottles:
b = 4 bottles
Hope this helps!! :)
Step-by-step explanation:

A, B, and C. the last one doesn’t work because 9x4=36, not 32
Answer:
35.09°
Step-by-step explanation:
You can use cos theta to find the value of x.
Let us solve now.
They have already given the lengths of the hypotenuse and adjacent.
Hypotenuse = 33
Adjacent = 27
Let us solve now.
Cos x = Adjacent ÷ Hypotenuse
Cos x = 27 ÷ 33
Cos x = 0.8181
x = Cos⁻¹ 0.8181
x = 35.09°
Hope this helps you :-)
Let me know if you have any other questions :)