15.789 rounding to the nearst hundredth

Jake bakes and sell apple pies. he sells each pie for $5.75 . the materials to make the pies cost $40. the boxes jake puts the pies in cost & 12.50 total. how many pies does jake need to sell to earn a profit of $50

What is the equivalent fraction for the following fraction using 5 as the multiplier? 1/2

How many significant figures are there in the number 10.76?