I need help with both 3 and 4 please help?

Find the vertex(use the completing the square method), findthe x- and y-intercepts, and sketch the graph offunction. y = 2x2 + 4x - 1

Which of the following harmful chemicals are found in tobacco smoke? a. carbon monoxide b. carbon dioxide c. nicotine b. carbon dioxide d. both a and c

How much energy must a refrigerator absorb from 225 g of water so that the temperature of the water will drop from 35°c to 5°c