Which equation represents a line that passes through (5, 1) and has a slope of 1/2?
a. y-5= 1/2 (x-1)
b. y- -1/2 = 5 (x-1)
c. y -1= 1/2(x-5)
d. y-1= 5{x-1/2}

How many 3-digit numbers can you write using only digits 1 and 7? (of course, digits can repeat.) how many 3-digit numbers can you write using only digits 1 and 7? (of course, digits can repeat.)