Answer:
The answer is option 3.
Step-by-step explanation:
You have to substitute H+=2×10^(-9) into the equation of pH :
pH = -log[H+]
H+ = 2×10^(-9)
pH = -log[2×10^-9]
= 8.70 (3s.f)
Hello,
A=(4,2)
B=(2,8)
(AB)≡y-2=(x-4)*(8-2)/(2-4) ==> y=-3x+14
(BC)≡y-8=(x-2)*1/3 ==> y=1/3 x+22/3
#1. x>1
#2. x≤-2
Always put the variable on the left and the inequality sign should be the way the arrow is facing on the graph
Step-by-step explanation:
an=-3n+50
Let n=15 -----because we need to find 15th term
a15=-3×15+50
=-45+50
=5