Solve the system using elimination: 1 3x+3y=27 x-37=-11 2 4x-7y=3 x-7y=-15 3 2x+3y=9 x+5y=8 4 3x+2y=17 2x+5y=26

The price of an item has been reduced by 30%. the original price was $30. what is the price of the item now ?

The position of a moving particle is given by the position function: f(t)=-9t-t^2-0.2t^3+0.1t^4 0 a. at what time does the particle reverse direction? b. when is the displacement positive? (round one decimal place and answer in interval notation) c. when is the displacement negative? (round one decimal place and answer in interval notation) d. when is the particle’s acceleration positive? (round one decimal place and answer in interval notation) e. when is the particle’s acceleration negative? (round one decimal place and answer in interval notation)

What is the length of the segment, endpoints of which are intersections of parabolas y=x^2− 11/4 x− 7/4 and y=− 7 /8 x^2+x+ 31/8 ?