The ratio of adults to children is 8: 5 of 390 people

Number of adult = 240 and Number of child = 150.

Step-by-step explanation:

Given : The ratio of adults to children is 8:5 of 390 people.

To find : find number of adult and children.

Solution : We have given

Ratio of adults to children is 8:5.

Let the number = x

Then number of adult = 8x .

Number of children  = 5x .

Total = 8x +5x = 13x

Number of adult = .

Number of adult = 240 .

Number of child = .  

Number of child = 150.

Therefore, Number of adult = 240 and Number of child = 150.

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