How many significant digits are in this number 85 000?

There are 2 significant figures in 85 000

A significant digit is a number that is used to express the required degree of accuracy, starting from the first non zero number. Therefore the number of significant digits in the number 85,000 is two: 8 & 5.

You can find the area of a rectangle by multiplying the length and height. so multiply 1/2*7/4(which is the simpler version of 1 3/4) and you get 7/8 as your answer.