Helpbi really need help ASAP if you know the answer

The triangles are similar. what is the value of x? show your work.

The radius of the circle is 4 cm and the measure of the central angle is 90° the area of the sector with a central angle measuring 90° and radius of length 4 cm is vt cm the triangle in the sector is 4 cm the area of the triangle is v/cm² the area of the segment of the circle is (471 - ) cm?

You are at a restaurant and owe $38 for your meal. you want to leave a 20% tip. how much will your tip be?