Solve these algebra 1 problems? 10 pts.

Find three consecutive numbers whose sum is 90.


The perimeter of a rectangle is 420 inches. The width is 4 inches less than the length. What is the length of the rectangle? (check)


Find a number which is 130 greater than its opposite. (check)


List five ways to transform equations into equivalent equations.

x+(x+1)+(x+2)=90
3x+3=90
3x=87
x=29
so the numbers are 29,30 and 31

w+4=l w=l-4
2w+2l=420
2(l-4)+2l=420
2l-8+2l=420
4l =428
l=428/4
l=107 in