(40 points) Which of the following are trigonometric identities?
Choose all correct answers.

sec²x - tan²x = 1
tan²x - sec²x = 1
sin²x + cos²x = 1
sec²x + csc²x = 1

Either enter an exact answer in terms of \piπ or use 3.143.14 for \piπ and enter your answer as a decimal.

What is the y-intercept of the line with the equation 3x + 4y = 12?

The spanish club and a car wash to raise money. and equation y=5x represents the amount of money y call members made for washing ex cars. identify the constant of proportionally. then explain what it represents in this situation