For what values of k does the graph of y=-2x^2+5x+k not cut the x-axis?

I want the working out to be detailed on how exactly do we solve this question.

A bookstore has 5 shelves of books about animals. There are 30 animals on each shelf. How many books about animals does the bookstore

A shampoo company recently paid a consulting firm to produce a study to determine if using their product resulted in cleaner hair than other brands. What is wrong with this study?

Loris book has 6 times more pages than sals book. the combined number of pages for the two books is 532. how many pages loris book have?

What expression is equivalent to 4x^5 x 2x^6 6x^30 8x^30 6x^11 8x^11 (the number next to the arrow is the exponent)

A line through the origin has a slope equal to two. Rotate this line about the origin by the angle (4/5,3/5). What is the slope of the resulting line? The answer is - 11/2 but i dont know how

An ice fun is made of 5 fluid ounces of water about how many milliliters of water does it take to make an ice cube

Which one of the following measurements represents the longest distance A. 1 km B. 10 cm C. 5 m D. 50 mm

Wich of the operations,+,-, x➗are inverse o each other

Scale 1:50. 18cm in this scale is equal to?

What is the unit rate to this math problem? 50 meters in 27.5 seconds?