So, if y varies jointly with x and z, that implies a direct proportionality.
The equation will look something like this:
y = xzk
"k" is the constant of proportionality.
Now, when y = 30, x =4, and z = 5:
30 = (4)(5)k
Multiplied:
30 = 20k
divided 30 by 20:
3/2 = k
So your final answer is:
The constant of proportionality in the equation y = xzk when y = 30, x = 4, and z = 5, is 3/2 or 1.5.
Hope that helps!
You said that M is 13.7% of N
In algebraic notation M = 0.137 N
Divide each side by 0.137 : N = M / 0.137 = 7.3 M (rounded)
Online or in a real book, you can look up the radius of Mars.
Then write it in place of 'M' in this solution, and you'll have
an actual number for the radius of Neptune.
The first one ....i belive.
