15 dollars
2 t-shirts
what is the ratio?

15:2

Step-by-step explanation:

Before writing this as a ratio, write it as a fraction;

15 dollars to 2 t-shirts = 15/2

15/2 cannot be simplified so write it as 15:2

v = 1/3 a^2h

step-by-step explanation:

the volume is 1/3 a^2h.