Simplify the following expression-4+3y-10+12x-y

2-digit numbers less than 91 which are 1 less than a multiple of 10

Atheater wants to build movable steps that they can use to go on and off the stage. they want the steps to have enough space inside so they can also be used to store props. how much space is inside the steps?

How many grams the dog will eat in 3 days?