Click on the photo to see it. I’m confused please help

1. In segment AC, the midpoint is B.
If segment AC=5 is length of AC
AB=7x-3 Find x

Draw the line segment AC
Label all points and measures
(Endpoints, midpoint, segment measure, and total length measure.)

Find the value of X.

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?

Prove the divisibility of the following numbers: 25^9 + 5^7 is divisible by 30.also, read as (25 to the power of 9) + (5 to the power of 7) is divisible by 30. blank x 30what is the blank? ( it should be expressed in exponent form)

Ijust need these 2 questions answered (the second pic is just confirmation i'm not confident in that answer)