Answer:
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I think you should try your best and just never get but just always keep trying because if you give up that means you're not track so just keep trying and get it right.
Answer:
(a) 51,100 kilometers.
(b)
meters
Step-by-step explanation:
(a) When converting from scientific notation to standard notation, split the equation.
When solving
, begin by calculating
.
= 10,000
Multiply this by '5.11', resulting in:
5.11 × 10000 = 51,100 kilometers.
(b) When converting from standard form to scientific notation, count the number of zeros until the first non-zero digit. Therefore:
In 0.00000768, the '7' is placed 6 digits from the decimal. Recall that for decimals, the exponent is negative. Therefore in scientific notation, this equals: 
Factor the numerator and denominator
(x^2-x-6)/(x^2-4)
((x-3)(x+2))/((x+2)(x-2)) the (x+2)'s cancel out leaving...
(x-3)/(x-2)