What is the result when the sum of 4x^2+8x-1 and 7x^2-3x+8 is multiplied by 5x^2 ?
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Answer:
11.3 Km
Step-by-step explanation:
Consider the right triangle formed by AB and West.
The acute angle WAB = 270° - 250° = 20°
and West is the adjacent side of the right triangle with AB the hypotenuse
Using the cosine ratio in the right triangle, then
cos20° = =
Multiply both sides by 12
12 × cos20° = adjacent
11.2763.. = adjacent, that is
B is 11.3 Km west of A
Remember the divisibility rule for 9. The sum of the digits of the number must be divisible by nine.
Let the digit be
. Then 
has to be divisible by nine. Recalling that 
, we note that 
.
Let the digit be