If you expand out the brackets you get this,
(4+5i)(a+2i) = 4a + (5a)i + 8i - 10
The -10 comes from 5i * 2i.
Squaring i becomes -1.
Let's group the real stuff together,
and imaginary separately,
(4a - 10) + (5a + 8)i
For this to be purely imaginary,
the real part needs to be zero.
Therefore 4a - 10 = 0
Solve for a.
Answer:
12/15
Step-by-step explanation:
If the probability of drawing a read marble is 3/15
Then that would just make the probability of NOT drawing a red marble 12/5
Answer:
Its A : 1188
Step-by-step explanation:
Because you have two heights 5 and 6 so add them together
5+6 = 11
then to get the volume you have to multiply length (9) , height (11), and width (12) to get the answer so..
11 x 12 x 9=1188
Hello,
g=9.81m/s²= 9.81/0.3048 =32.18.. ft/s² rounded to 32
h=-g/2*t²+vt+h0
if t=0,h=0 ==>h0=0
==>h=-16*t²+vt
50 ft in 2.5s ==> 25 ft in 1.25s
25=-16*1.25²+v*1.25
==>v=50/1.25=40
Equation h=-16t²+40*t
