Algebra. it's almost the end of 2018 and the beginning for 2019, and i kind of need a little push, so can someone me ? 20 pts for whoever answers. tell whether the system has one solution, infinitely many solutions, or no solution. 9x+ 8y= 15 9x+ 8y= 30 5x- 3y= 10 10x+ 6y= 20 2x- 7y= 17 6x- 15y= 51 a. one solution b. infinitely many solutions c. no solution

1 C

2 A

3 B

Hope this helps

step-by-step explanation:

the original amount doesn't ''re just looking for the time it takes for 1/2 of the substance to we have

(1/2) =)     take the ln   of both sides

ln (1/2)   = )   and we can write

ln(1/2) = ) lne     and lne   = 1     so we have

ln(1/2) = -.1092t     divide both sides by -.1092

t = ln(1/2)/-.1092 = about 6.347 days = about 6.3 days (rounded)