Please please help me I am confusing my self will give lots of points andbr />

Given: x + y = 6. if xe (-15, -6, -1), then which of the following sets of ordered pairs are solutions? © {(-15, -21), (-6, -12), (-1, -7)} [(-15, 21), (-6, , 7)} {(-15, 21), (-6, 12), (-1, -7)}

Write the equation in logarithmic form 8^x=64

Plz hurry evaluate the expression a+b where a=8 and b=19