Help me pleasee k = 4.61

Find the equation of the normal line of the curve f (x, y) at the point y = 0.5

Simplify. (-2)^-3 a. -8 b. -1/8 c. 1/8 d. 8

What is the length of the segment, endpoints of which are intersections of parabolas y=x2? 11 4 x? 7 4 and y=? 7 8 x2+x+ 31 8 ?

The floor of a building consists of 3000 tiles which are rhombus shaped and each of it's diagonals are 45 cm and 30 cm in length. find the total cost of polishing the floor, if the cost per m² is rs. 4.