20 points and brainliest if answered and explained!

triangle abc has the angle measures shown.

m∠a= (2x)°
m∠b= (3x)°
m∠c= (4x)°

which statement is true about the angles?

a) m∠a= 20°
b) m∠b= 60°
c) ∠a and ∠b are complementary
d) m∠a+m∠c= 100°

Ahiker stands at an unknown elevation before he ascends 2 miles up a mountain to an elevation of 9 miles. find the elevation of the hiker before his ascent.

Louis wants to carpet the rectangular floor of his basement the basement has an area of 864 square feet the width of the basement is 2/3 its length what is the length of lewis's basement

The point of intersection of the diagonals of a rectangle is 4 cm further away from the smaller side then from the larger side of the rectangle. the perimeter of the rectangle is equal to 56 cm. find the lengths of the sides of the rectangle. 16 points answer quick