Can someone me with these problems? the majority of them i have answers but i don't understand them.
what is the area of the triangle with a base of 5 1/2 cm and a height of 3 1/2 cm?
my answer - 11 1/2
919÷ 2
round to the nearest whole
my answer-?
what is the area of a parallelogram with a base of 14.5 m and a height of 21 m?

the cafeteria sold 200 grilled cheese sandwiches, 100 tacos, and 150 grilled chicken salads. what is the ratio in simplest terms of grilled chicken salads sold to the total number of lunches sold?
my answer- 1: 3
what is the ratio of odd to even digits in the following number:
7,208,631
my answer- 3: 4

given that one ton is equal to 2000 pounds, what is 5 tons?
my answer- 400 or 1000
a table measures 3 feet across. how many inches is this?
my answer-36