The symbol √ means "square root of". √16 means "square root of 16".
It's a number that gives 16 when you multiply the number by itself.
There are <u>two</u> numbers that can both do the job. They are +4 and -4.
(+4) times (+4) = 16
(-4) times (-4) = 16
C = 8/7(k - 55)
7/8 c = k - 55
k = 7/8 c + 55
Answer: 
Step-by-step explanation:
Group like terms:

Simplify the arithmetic:

Add 7 to both sides:

Simplify the arithmetic:

Simplify the arithmetic:

Divide both sides by 3:

Simplify the fraction:

Find the greatest common factor of the numerator and denominator:

Factor out and cancel the greatest common factor and the answer will be:

Answer:77
Step-by-step explanation:
So lets say the distance one boy travels is 'x', you can set up an equation like this:
x + x + 1 = 7
2x +1 = 7
2x = 6
x = 3
So one boy walks 3 miles in one hour, and the other walks 4 miles in one hour.
Therefore, their speeds are 3 miles per hour and 4 miles per hour respectively.