Which of these expressions cannot be simplified by combining like terms? 6fg3+4−4f2g2+f3g−12 6fg3+2f(2fg)+4f2g−10 6fg3+5f2g2+f3g−7 6f3g3+7f2g2+4f3g3−10fg

Solution:

An expression is said to be like, if there are only constants term in it, otherwise degree of variables in two distinct terms are same.

Starting from option (1)

1. As, 4 and -12 are like terms, they are combined to get  -8.

2. As, 2 f( 2 f g) and are like terms, so they can be combined to get  .

3.

as,there are no like terms, so, we cannot simplify this expression.→→→Correct Option,This expressions Cannot be simplified by combining like terms

4. As, are like terms.They can be combined to get a unique term.

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)

b) 1/3 * 1/5

step-by-step explanation:

each smallest part is 1/15 since the written one is 1/5 and it's divided by 3 equal parts. (1/5 )/3 = 1/15 = 1/3 * 1/5