Estimate quotient 17.5 divided by 5

Evaluate 8j -k+148j−k+14 when j=0.25j=0.25 and k=1k=1.

How many kilograms of a 5% salt solution and how many kilograms of a 15% salt solution must be mixed together to make 45kg of an 8% salt solution?

Ihave a triangle with a 60 degree angle. lets use d for that angle. what are the values of e and f if d is 60 degrees? and what do you notice about the values of e and f?