Please answer this correctly without making mistakes

Write numerical coefficient of y² in the expression 2x² - 15xy – 7y²

Which word in the sentence below is an interrogative pronoun? who is picking us up from school? whousisfrom

Find the volume of the solid whose base is the region bounded by f(x), g(x) and the x-axis on the interval [0, 1], and whose cross-sections perpendicular to the y-axis are squares. your work must show the integral, but you may use your calculator to evaluate it. give 3 decimal places for your answe