A wedding planner uses 72 ivy stems for 18 centerpieces. When she arrives at the venue, she realizes she will only need 16 centerpieces. How many ivy steams should she use so that the ratio of ivy stems to centerpieces stay the same ?

64 ivy stems

Step-by-step explanation:

Ratio of ivy stems to centerpieces:

72/18 = 4 ivy stems per centerpiece

Therefore,

16 x 4 = 64

64 ivy stems

Step-by-step explanation:

There's 72 ivy stems for 18 centerpieces meaning 4 stems per 1 centerpiece.

to answer multiply by 16:

1:4 x 16 = 16 centerpieces and 64 stems

h df tyjgtyj ttd y ytkgfty ty

step-by-step explanation:

tyty jry j y yj yttj yhgtyj y ghyj ytthj

x = ±sqrt(10)

step-by-step explanation:

5 - 2x² = -15

subtract 5 from each side

5-5 - 2x² = -15-5

-2x^2   = -20

divide by -2 on each side

-2x^2   /-2= -20/-2

x^2 =10

take the square root on each side

sqrt(x^2 )=±sqrt(10)

x = ±sqrt(10)

check:

5 - 2x² = -15

+sqrt(10)

5 - 2(sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15

-sqrt(10)

5 - 2(-sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15