What are the solutions of the equation x4 + 6x2 + 5 = 0? Use u substitution to solve. x = i and x = iStartRoot 5 EndRoot x = plus-or-minus i and x = plus-or-minus iStartRoot 5 EndRoot x = plus-or-minus StartRoot negative 1 EndRoot and x = plus-or-minus StartRoot negative 5 EndRoot x = plus-or-minus Negative 1 and x = plus-or-minus -StartRoot 5 EndRoot

a 4/6 = 9/12   not proportional

step-by-step explanation:

to find which are not proportional, we can use cross products

if it is true, they are proportional.   if it is not true, they are not proportional.

a 4/6 = 9/12

4* 12 = 6*9

48 = 54

not this is not proportional  

b 2/3 = 12/18  

2* 18 = 3 * 12

36 = 36

this is proportional

c 5/4 = 10/8  

5*8 = 4*10

40 = 40

this is proportional

d 7/5 = 35/25

7*25 = 5 * 35

175 = 175

is proportional

a

step-by-step explanation:

u take $30 minus $24. the answer/original($30)

b

step-by-step explanation:

i dont know