Answer:
5.43×10^14 or

Step-by-step explanation:
Scientific notation, the number must always be less than 10, in this case 5.43. The exponent represents how much times I moved the decimal point to the left.
Answer:
7
Step-by-step explanation:
5+2=7
Answer:
28,543
Step-by-step explanation:
If we take the height of Mt. Everest (29,028) and the height of the Dead sea (-485) and subtract we get the `answer of 28,543.
Make 37.5% into decimal form : Since it is being marked up, add 100% = 1.375
1.375 x 80
1.375
x 80
_________
0000
+11000
_________
110.000
80 marked up by 37.5% is 110.