1. Simplify:
points)
(2x - 3x2 + 4x3 – 6x5) + (7x6 – 5x3 + 3x²)

7x⁶ - 6x⁵ - x³ + 2x

Step-by-step explanation:

Step 1: Write expression

(2x - 3x² + 4x³ - 6x⁵) + (7x⁶ - 5x³ + 3x²)

Step 2: Combine like terms (x³)

7x⁶ - 6x⁵ - x³ - 3x² + 2x + 3x²

Step 3: Combine like terms (x²)

7x⁶ - 6x⁵ - x³ + 2x

360 different combinations

(sin 42)/31. = sinx)/37

sinx = 37 (sin42)/31

= 37× 0.66/31 = 0.787

x= 51.9

other angle opposite to y = 180-51.9-42

= 180- 93.9 =86.1

so

sin42)/31 = sin 86.1)/y

0.021 = 0.997 /y

y= 0.997/0.021 =47.47