Adiver begins at 90 feet below sea level. she descends at a steady rate of 6 feet per minute for 6 minutes. then, she ascends 20 feet. this expression shows her current depth in feet. -90 -6(6)+20 what is her current depth? -596 feet -556 feet -146 feet -106 feet

What we must do for this case is to use the following expression:
 -90 -6 (6) +20
 Then, let's rewrite it:
 - 90 - 36 + 20
 We add all the terms algebraically:
 -126 + 20
 -106 feet
 
 her current depth is:
 -106 feet

Intersecting secant-tangent theorem states that if a tangent segment and a secant segment are drawn to a circle from an exterior point, then the square of the measure of the tangent segment is equal to the product of the measures of the secant segment and its external secant segment.so to break it down: 1. pq acts as the tangent and ps as the secant with an intersection at p.sr = 21rp = 3x + 3pq = 4x + 4following to equation: tangent squared = the two segments multiplied by each otherso (4x + 4) ^ 2 = (3x + 3) • (21) simplifies to 16x^2 - 31x - 47 = 0 or (16x - 47)(x + 1) x = -1 or x = 47/162. pq acts as the tangent and ps as the secant with an intersection at p (again! )sr = 16rp = xpq = 15(15) ^ 2 = 16 • x225 = 16xx = 225/163. the interesting chords are proportional to each other so a ratio is possible to set up: ap dp 10 3 + x = = —— = pc pb 8 xcross multiple to get 10x = (3 + x)(8)x = 12