With 4 algebra
7. evaluate 1/2a^4b^2 for a = –2 and b = 4. (1 point)
a)2 
b)1/2
c)3
d)4
8. is the following statement always, never, or sometimes true?
a number raised to a negative exponent is negative. (1 point)
a)always
b)never
c)sometimes 
9. simplify (4xy^2)^3(xy)^5 (1 point)
a)64x^8y^11
b)64x^15y^30
c)12x^2y^11
d)12x^8y^11 
10. simplify (2t^3)^3(0.4r)^2 (1 point)
a)3.2r^2
b)1.28r^2/t^-6 
c)1.28r^2/t^9
d)0.8r^2/t^-6