Please help, Thank you.​

It's all about the ratios of corresponding sides.

I'll do #6 for you.

x=13.33

Step-by-step explanation:

4/x=(4+3)/(x+=10)  this is the ratio

4(x+10)=(3+4)(x)

4x+40=7x

4x-4x+40=7x-4x

3x=40

x=13.33

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)