What is the difference of the polynomials (86^6s^3-9r^5s^4+3r^4s^5) -(2r^4s -5r^3s^6 - 4r^5s^4

Tickets to a science exposition cost $5.75 each for studentd and $7.00 for adults.how many students and adults went if the ticket charge was $42.75

The square root of 9x plus 7 plus the square rot of 2x equall to 7

The length of a shadow of the building is 36m. the length of the pole, which is perpendicular to the ground, is 1.9m. the length of the pole's shadow is 1.52m. what is the height of the building?