The solution to the problem is 16.
first, you must set up the equation.

Then, simplify exponents.
256*
Next, simplify the equation.
16
Answer:
a. L.B. = 20.5
b. U.B. = 21.5
Step-by-step explanation:
Length is measured 21 cm correct to 2 significant figures
a. Lower bound of 21
= 20.5 < 21
= 20.5
b. Upper bound of 21
= 21 < 21.5
= 21.5
Find 30% of 150. To do this, mult. 150 by 0.30. Result: 45.