Enter values for a and b so that the system of equations shown has infinitely many solutions. y=2x+a
y=bx-3

A=__

B=__

A20? -foot ladder is placed against a vertical wall of a? building, with the bottom of the ladder standing on level ground 19 feet from the base of the building. how high up the wall does the ladder? reach?

Christine went shopping and bought each of her six six nephews a? gift, either a video costing? $14.95 or a cd costing? $16.88. she spent ? $ 97.42 97.42 on the gifts. how many videos and how many cds did she? buy?

Prove that the value of the expression 7^8–7^7+7^6 is divisible by 43.