Well what exactly do you need help with?
Plug in values and check for equality.
2(3)+5(1/5)=5
6+5(1/5)=5
6+1=5
7=5
Final answer: No
Step-by-step explanation:
15a)
Subtract both sides by 21

15b)
7 and -3 multiply to -21 and add to 4
The factors are (x+7)(x-3)
15c)
x+7 =0
x=-7
x-3=0
x=3
The answer is subtraction
Answer: C
Step-by-step explanation: The opposite of a positive integer (18) is -18
Which also means its value is 18
Hope this helps!