Can someone’s solve these please

Find an equation of the line perpendicular to the graph of 28x-7y=9 that passes through the point at (4,1)

Acompany made a profit of 75000 over a period of 6 years on an initial investment of 15000 what is the annual roi

The perimeter of an equilateral triangle is 4 cm more than the perimeter of a square and the length of a side of the triangle is 8 cm more than the length of a side of the aware. find the length of a side of the equilateral triangle