Identify the value for the variable.
What is the value of x in this simplified expression? 7^-9*7^-3=7^x
a.-12
b.-6
c.3
d.27

Combine like terms to make a simpler expression 3z+z

Acircle has a circumference of 7.850 units. what is its radius?

Given that y varies directly to the square root of (x + 1), and that y = 1 when x = 8,(a)express y in terms of .x,(b)find the value of y when x = 3,(c)find the value of x when y = 5.