Which algebraic expressions are polynomials? check all that apply.

pi x minus startroot 3 endroot + 5 y
x2y 2 – 4x3 + 12y
startfraction 4 over x endfraction – x2
– 16
3.9x3 – 4.1x2 + 7.3

24

step-by-step explanation:

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

3

step-by-step explanation:

because where the point where the 2 lines intersect is (3,-1) the x value is 3

the answer to question 1 is -8, 28.

step-by-step explanation: