Determine which of the following equations have a graph whose y-coordinate of the y-intercept is positive....

Determine which of the following equations have a graph whose y-coordinate of the y-intercept is positive. Select all that apply.
☐ y = −x² + 7x + 9
☐ y = (x − 3)² − 1
☐ y = (x − 3)(x + 7)
☐ y = (x + 7)(x + 3)
☐ y = −2x² + 7x − 3
☐ y = (x + 2)² − 8