math
posted by help? .
Calculate the value of the following in exponential form, using standard scientific or "e" notation (for example, 105 = 1.05e2). Enter your answer with the correct number of significant figures.
885.75 g + 10.151 g  25.50 g
Calculate the value of the following in exponential form, using standard scientific or "e" notation (for example, 105 = 1.05e2). Enter the correct number of significant figures.
(2.700e2 cm)3 / (1.20e3 cm)2
Calculate the value of the following in exponential form, using standard scientific or "e" notation (for example, 105 = 1.05e2). Enter the correct number of significant figures.
95.8 g + 25.555 g + 37.60 g

Anica and her friends are organizing a trip to the skateboarding championships.The bus they will rent to take them there and back will cost $500. Anica estimates that each person will spend $40 for meals and souvenirs.
If p People go on the trip, what will be the total cost for travel,meals,and souvenirs? 
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Thank you. 
1.
The least precise number has 4 significant figures, so the answer can be presented to 4 or 5 significant figures for intermediate calculations, and in this particular case where the least significant number is a small number).
885.75 g + 10.151 g  25.50 g
=870.40
=8.7040e2
Give a try to #2 and #3. Post for confirmation if you wish. 
for #2 it's
((2.70000e2 cm)^3) / ((1.20e3 cm)^2) = 13.66875 centimeters