Deanna calculator that she about 5.4 x 10^4 seconds doing her math homework during October write this time in standard notation

2 answers:

4 0

4.875 × 105
(scientific notation)

= 4.875e5
(scientific e notation)

= 487.5 × 103
(engineering notation)
(thousand; prefix kilo- (k))

beks73 [17]4 years ago

4 0

Since the exponent of the scientific notation is positive 4, move the decimal point 4 places to the right . answer is: 54000

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$\begin{array}{lcccl} &\stackrel{miles}{distance}&\stackrel{mph}{rate}&\stackrel{hours}{time}\\ \cline{2-4}&\\ Jill&d&r&2.5\\ Steve&120-d&2r&2.5 \end{array}~\hfill \begin{cases} d=2.5r\\[2em] 120-d=5r \end{cases} \\\\\\ \stackrel{\textit{substituting on the 2nd equation}}{120-2.5r=5r\implies 120=7.5r}\implies \cfrac{120}{7.5}=r\implies \stackrel{Jill's}{16=r}~\hfill \stackrel{Steve's}{32}$