First you must change 3/8 into a decimal, so the number would be 45.375. To find scientific notation you have to move the decimal between a factor of 1-10. 4.5375 . You moved over the decimal once toward the left. so scientific notation would be 4.5375 X 10^1
89+90=171. keep in mind that increased or increased by means to add
The cost of aquiring the source is high, i believe
Substitute 15 for p and 12 for q in p + q. We get 15 + 12, or 27.