exam Maths Puzzle Numerical Ability

Dear tutors,

Simplify y^3*y^2*y^4

Does it equal

A.)y^9

B.)y^24

C.)24y^4

D.)2y^7 Thanks so much!

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exam Other Question

Two towns are 80 km. apart. Sylvia wants to drive from one town to the other in exactly one hour. The first 30 minutes she drives at a rate of 60 km/hr. At what constant rate must she drive for the next thirty minutes to accomplish her goal? Are the following lines parallel, perpendicular, or neither?
L1 through (9, 2) and (3, -8)
L2 through (-3, 5) and (5, -1)