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.

How much greater 20 than 12?

Solve the inequality 2 less than or equal to x and negative 3 less than or equal to 6

Solve the system by substitution. -2x=3y=9 -x=y

Andrew is a small business owner who wants to hire an accountant. Accountant A is offering his services for $50 an hour. Accountant B is offering her services for $35 an hour plus an initial fee of $375.

Skylar is driving on a long road trip. She currently has 9 gallons of gas in her car. Each hour that she drives, her car uses up i gallon of gas. How much gas would be in the tank after driving for 5 hours? How much gas would be left after t hours?

A sales associate is giving a $500 hiring bonus with a new job she earns an average commission of $250 per week for the next 12 weeks how much does she earn

Mia plans to use $260 less than three fourths of her savings to buy a car. If the purchase of the car is $9,340, how much does she have in savings?

A rectangular carport has area of 150 squarefeet. The width of the carport is five feet less than twice its length. Find the length and the width of the carport.

Ancient chemistry class Andrew has earned scores of 64 69 and 73 on three tests he must maintain an average of 70 to pass the course. what score must Andrew earn on the final exam to pass the course

Is 3/5 equivalent to 6/8