8. (10%) Maximize f(x,y,z) = xyz subject to the side condition
x3 + y3+ z3 = 1, with x≥0, y≥0, z≥0.
7. (10%) Show that the series converges on [-1,1).
6. (20%) Let f(x,y) = 3x2 + y.
(d) (5%) Notice that i + 4j is a direction vector for the line y=4x-4 and this line is tangent to the parabola y=x2 at (2,4). Explain why the computations in ( a ), ( b ), and( c ) yield different values.
60.According to the picture, which tire has the right tire pressure?
(A)A (B)B (C)C
59.According to the picture, when motors break down, how should riders deal with the problem?
(A)A (B)B (C)C
This is a large modal.