Maths - 7 out of 10 students are boys. If there are 30 students, how many of them are girls? Help me I stuck

Choose the triangle with x equal to 17.

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?

Which inequality statement describes the two numbers on a number line? "? 7 and a number 5 units to the right of ? 7"