Answer:
sin(a)=20/29
cos(a)=21/29
Answer:
Answer is below
Step-by-step explanation:
Add 9 to both sides.

Divide both sides by 6

Use TrianCal to draw a triangle with phi as Great Piramid (minimum perimeter given 2 equal heights) = maximun stability.
NOTE: Phi=(1+√5)/2≈1.62 and acos(1/Phi)≈51.83º
Let x be the original amount as per the ques tion (7/6) x= 420thus x=420*6/7=360thus the interest earned is 420 -360=60