N + d = 30
0.05n + 0.10d = 2.20
^^ ur system of equations
There is a lot of numbers
Answer:
is 
Step-by-step explanation:
var x = +3 (one side of right angled triangle)
var y = +1 (the other side of the right angled triangle)
Use the Pythagoras' Theorem.
3² + 1² = 10
Bottom right corner is the correct answer choice