Please help me with these two problems they're the last two!

Convert 16 yards to feet use the conversion rate 3 feet = 1 yard

Pick the expression that matches this description: a polynomial of the 5th degree with a leading coefficient of 7 and a constant term of 6 (choice a) 7x^5+2x^2+6 (choice b) 7x^6−6x^4+5 (choice c) 6x^7−x^5+5 (choice d) 6x^5+x^4+7

Atriangle with all sides of equal length is a/an triangle. a. right b. scalene c. equilateral d. isosceles