Which equation represents a hyperbola? 4x2 + 3x + 4y2+ 5 = 0 2x2 – 5xy + 4y2 + 10x – y + 12 = 0 3x2 - 6xy + 3y2 + 5x – 2y + 1 = 0 3x2 + xy - 9y2 + 2x + 5 = 0​

Which speed is the fastest (use 1 mile ≈ 1.6 kilometers)? a. 12 miles/hour b. 18 feet/second c. 19 kilometers/hour d. cannot be determined

Adriana sold 50 shares of a company’s stock through a broker. the price per share on that day was $22.98. the broker charged her a 0.75% commission. what was adriana’s real return after deducting the broker’s commission? a. $8.62 b. $229.80 c. $1,140.38 d. $1,149.00

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).