4/5 y + 7/10 z - 1/5 y + 1/5 z . combine like terms .

3/5 y   +9/10 z

Step-by-step explanation:

4/5 y + 7/10 z - 1/5 y + 1/5 z

4/5 y - 1/5 y + 7/10 z + 1/5 z

We need to get a common denominator for the z term of 10

4/5 y - 1/5 y + 7/10 z + 1/5 *2/2 z

4/5 y - 1/5 y + 7/10 z + 2/10 z

3/5 y   +9/10 z

show us the picture

step-by-step explanation:

show the !

x =-.20752

step-by-step explanation:

4^(x+2)=12

4^(x+2)=12

take the log base 4 on each side

log 4 (4^(x+2) = log 4(12)

we know log b(a^y) = y log b (a)

(x+2) log 4(4) = log 4 (12)

x+2 = log 4 (12)

we know   logb c = loga c/loga b

we want to convert to base 10   so a = 10

by default, we do not write the 10   c = 4   and b = 10

log4 10 = log 12/log 4

log4 10 = log 12/ log 4

x+2 = log 12/ log 4

subtract 2 from each side

x +2 -2 = log 12/ log 4 -2

x = 1.79248125 -2

x =-.20752