Let h = the number of hours Marta works
Her savings in her account can be calculated by:
840 + 15h
This needs to be at least $2650 for her trip, so an inequality to solve:
840 + 15h ≥ 2650, where h is the number of hours worked
Now solve:
15h ≥ 1810
h ≥ 1810/15
h ≥
Marta needs to work at least hours in order to have enough money for her trip.
Answer:
30500 = 3.05·10^4
Step-by-step explanation:
Your calculator can do this for you. You may need to set the display to scientific notation, if that's the form of the answer you want.
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This can be computed by converting both numbers to standard form:
(5·10^2) +(3·10^4)
= 500 +30000 = 30500 = 3.05·10^4
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Addition of numbers in scientific notation in general requires that they have the same power of 10. It may be convenient to convert both numbers to the highest power of 10.
5·10^2 + 3·10^4
= 0.05·10^4 +3·10^4 . . . . now both have multipliers of 10^4
= (0.05 +3)·10^4
= 3.05·10^4
