Find all values of x (if any) where the tangent line to the graph of the function is horizontal

Y = 2+8x-x^2

Q1 Find the area of a rectangle whose length and breadth are (x+y) and (x * - xy + y*) respectively. Q 2 Sum of the digits of a two-digit number is 9.

Suppose that the minimum score on certification test is 200 and the maximum score is 1000. Write an absolute value equation that represents the minimum and maximum scores. Use x to represent the scores.

Evaluate. 8d - 4 / 3 + c. when d = 5 and c = 6.

How many solutions does the pair of equations y = 0 and y = - 5 have?

Marina and Kevin have two children, one boy and one girl, and the four of them live together in one house. This type of family is called a (n)

A newspaper reporter wants to know how popular the hobby of bird watching is in the city. He asked people at the local bird refuge if they watched birds as a hobby. Which of the following best explains whether the reporters data is valid or not?

I am very confused on how to figure out if y = 3/4x is proportional?

Alison wants to buy a mountain bike for $339.12. If she saves $28.26 each month, in how many months will she be able to buy the bike?

At 12 o'clock the temperature was 7°C. The temperature decreased by - 20°C. What is the new temperature?

Ashleys rentals charges $27.50 per hour to rent a surfboard and a wetsuit. Darlas surf shop charges $23.25 per hour to rent a surfboard plus $17 extra for a wetsuit.