Please help I don’t understand

Scrub a dub toothbrushes are $4.00 each. there is a 10% discount, but there is also a 6% sales tax after the discount is applied. what is the new price after tax? round to the nearest penny

Jenisey has $24 to spend on seven pencils. after buying them she had $10. how much did each pencil cost.?

Which number line represents the solution set for the inequality - x 24?