Answer:
Step-by-step explanation:
Set this up as a proportion
20/8 = 15/vx Cross multiply
20*vx = 8 * 15
20 * vx = 120 Divide by 20
vx = 6
<h3>
Answer: 5 - 4i (choice A)</h3>
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Work Shown:
x = the other number
(5+4i)*x = 41
x = 41/(5+4i)
x = 41*(5-4i)/( (5+4i)*(5-4i) ) ..... see note below
x = 41*(5-4i)/( 41 )
x = (41/41)*(5-4i)
x = 5 - 4i
As a way to check, (5+4i)*(5-4i) = 5^2+4^2 = 25+16 = 41
The rule used is (a-bi)(a+bi) = a^2 + b^2
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Note: I multiplied top and bottom by (5-4i) to get rid of the imaginary term in the denominator.
10cm is about a postage stamp
50cm is about a pencil
100com is about your out stretched arms
1m is the same as 100cm
1m talk is about a 3 year old
50m talk is a 3-4 story building
10m wife is about a truck
6 + 4 ÷ 2
The "order of operations" (which you learned a long time ago
if you're in high school now) says that division should be done
before addition.
So do the division: 4 ÷ 2 = 2
Now you have 6 + 2
Now do the addition: 6 + 2 = 8 .