Answer:
2
Step-by-step explanation:
4x + 1 = 3x + 3
4x - 3x = 3 - 1
x = 2
2 x 4 + 1 = 9
3 x 2 + 3 = 9
explanations: we multiply with a rational surd
(x-9)*√(x+9)/(√(x-9)*√(x+9)
=(x-9)√(x+9)/
B.( x-9)/√x+3 =( x-9)*(√x-3)/(√x+3)*(√x-3)
= (x-9)*(√x-3)/x-9
=√x-3
Answer: 1.25 problems/min
32 minutes --> 40 problems
1 minute --> 40/32
--> 1.25