1.B
2.B
im not sure about this one but ill have to say c sorry if im wrong on 3
4.A i think
A controlled variable is an element that remains unaffected and unchanged by other variables.
:)
Step-by-step explanation:
Answer:
12
Step-by-step explanation:
(1/3) x + 5 = 9
(1/3) x = 9 -5
(1/3) x = 4
Multiply both sides by 3
x = 12
The expression, 11p-13, models the number of pencils Mark has left