If u subtract 12 from a number and multiply the result by 12 you get 18. what is the number​

Varies inversely with x. if y=8.5 when x=-1 find x when y=-1

20 points for the answer. this is for real , don't put random ! a rectangle has a length of 4 centimeters and a width of 7 centimeters. what is the effect on the perimeter when the dimensions are multiplied by 5? the perimeter is increased by a factor of 5. the perimeter is increased by a factor of 20. the perimeter is increased by a factor of 25. the perimeter is increased by a factor of 100.

Use the second shift theorem to find the inverse laplace transform of (e^−3s) / (s^2 + 2s − 3)