Lisa is 8 centimeters taller than her friend lan. lan is 12 centimeters taller than Jim. Every month, their heights increase by 2 centimeters. In 6 months, the sum of lan's and Jim's heights will be 160 centimeters
more than Lisa's height. How tall is lan now? Let h be lan's height today in centimeters.
(h +12)+(
) + 12 =(
) + 12 + 160
lan is
centimeters tall now.
Explain Concept 4

On the way home from visiting his family, vincent’s plane cruised at an altitude of 3.2 × 10^4 feet. he had heard that a man named felix baumgartner skydived from an altitude of 1.28 × 10^5 feet. vincent wants to know how much higher felix went on his skydiving trip. question 1 you have already seen how adding numbers works in either scientific notation or standard notation. but can you subtract numbers in scientific notation and get the same results as subtracting in standard notation? to find out, first solve vincent’s problem in standard notation. part a write the cruising altitude of vincent’s plane in standard notation.