Answer:
B
Step-by-step explanation:
A has 2 it crosses the x axis 2x
B Has 1.
C has 2
D has none since it never touched the x axis
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:
515
Step-by-step explanation:
it's self-explanatory
The answer is $48.
Divide her savings by 3 since it is only three-fourths of the game's cost.
$36÷3 = $12
Now you multiply the answer by 4 to get the final answer.
$12 × 4 = $48
Answer:
Center of rotation
Step-by-step explanation:
