Answer:
$63
Step-by-step explanation:
30% of 90 is 27
90-27=63
Answer:
The answer is 
Step-by-step explanation:
when writing scientific notation, there must be one number to the left of the decimal point.
To achieve this in this problem, you need to move the decimal point 3 times to the right.
because you are moving the point to the right, the exponent will be negative.
*rule of thumb: moving the decimal to the left will give you a positive exponent, moving to the right will give you a negative exponent*
therefore you answer should be written as:

hope this helps :)
Answer:
-14
Step-by-step explanation:
a(3)=a(2)-17=a(1)-17-17=20-17-17=-14
$90 because 200-10=180 and divide 180 by 2 which is 90.