Is f (x) = sec x concave up or concave down at x = 17/pi/4

What is the value of y in the equation 2 (2y - 16) = 0? 4 6 8 9

Five more than twice a number is?

Let f be the function defined as follows. y=f (x) = (8x^2) - 2x+3 (a) Find the differential of f. dy = (16x-2) dx (b) Use your result from part (a) to find the approximate change in y if x changes from 2 to 1.97.

A coffee business sells a pound of coffee for $ 9.75. Monthly expenses are $ 4,500 plus $ 4.25 for every pound of coffee sold. a. Write an IT function for total monthly income as a function of the number of pounds of coffee sold. b.

If 2+2 equals 4 what is the square rate of 81

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.