a/c = d/a
you would cross multiply to get aa = cd
aa = a^2
so you would have a^2 = cd
Answer:
attached the drawing
Step-by-step explanation:
hope it works
The correct answer is the 2.4
The constant in an equation is the number(s) that don't have variables.
This is because variables can change the number they are attached to, making them not constant.
Hope this helps!

We know that
and 
Substitute in the value. 
Use a calculator to multiply. 