Awnser all and get 20 points and i will mark you brainiest

The lengths of all sides of a triangle are integers when measured in decimeters. one of the sides has length of 1 dm and another of 3 dm. find the perimeter of the triangle.'

If x-1 and x+3 are the factors of x3+10x2+ax+b find a and b

The experience c-0.25c can be used to find the cost of an item on sale for 25% off which expression beloit equivalent to c-0.25c