Question

Application problems and converting decimals is not my forte. Please help me?

Dick mows the lawn in 7 hrs. Mary can do the same yard in 6 hrs. How much time would it take for them to mow the lawn together? (They are sober btw)

8.26 x 10^7 Convert to decimal notation please.

I keep messing up on the 0's

An explanation could be helpful.

Thanks

Answer 1

the 10^7 means you move the decimal 7 places to the right

Answer 2

so 8.26 would be 82600000. those wouldnt be o's though i just don't know hwat the number is

Answer 3

(a)
x/7 + x/6 =13•x/42,
x /(13•x/42) = 42/13 =3.23 Hrs.
(b) 8.26 x 10^7 = 82,600,000