Answer:
k=60
Step-by-step explanation:
2k+11=131
2k=120
X² - 5 = 0
x² = 5
square on both side
x = 5²
x = 25
May mine aswer might be wrong please retrify but as per my point of view it will be write
61×10/100
=610/100
=6.1 g
i think you grade would go to 69%
