2 years ago

Each Sunday, Mario weighs himself. Here are his weight changes over a 4-week period.

Mathematics

2 answers:

pashok25 [27]2 years ago

5 0

The correct answer is c

Dmitry [639]2 years ago

4 0

So the answer is –1.8 +0.9 –1.4 +0.4
or C. -1.9

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2x10^-4 - 1x10^-5 show work. I got an answer of 1.9x10^-4,

oksian1 [2.3K]

$\bf \left.\qquad \qquad \right.\textit{negative exponents}\\\\
a^{-{ n}} \implies \cfrac{1}{a^{ n}}
\qquad \qquad
\cfrac{1}{a^{ n}}\implies a^{-{ n}}
\qquad \qquad 
a^{{{ n}}}\implies \cfrac{1}{a^{-{{ n}}}}\\\\
-------------------------------$

$\bf 2\times 10^{-4}-1\times 10^{-5}\implies 2\cdot \cfrac{1}{10^4}-1\cdot \cfrac{1}{10^5}\impliedby 
\begin{array}{llll}
\textit{using the LCD}\\
of~10^5
\end{array}
\\\\\\
\cfrac{2}{10^4}-\cfrac{1}{10^5}\implies \cfrac{(10\cdot 2)~-~(1\cdot 1)}{10^5}\implies \cfrac{20-1}{10^5}\implies \cfrac{19}{10^5}
\\\\\\
19\cdot \cfrac{1}{10^5}\implies 19\times 10^{-5}$

8 0

2 years ago

Read 2 more answers

The school band is having a car wash to raise money. There goal is to collect $150. So far they have earned $10 each from three

Lady bird [3.3K]

They’ve already earned $105 so they need $45 more to reach their goal

4 0

2 years ago

Helen is 8 years older than Jane. Twenty years ago Helen was three times as old as Jane. How old is each now?

Ganezh [65]

Helen is 16 and Jane is 8

3 0