0.001980 should be your correct answer
Factor it out.
Both exponent cancel out each other which equals 1.
For the numeric part, you'll have to find the GCD of 15 and 25, which is 5. So, we can factor a 5 and we have
As for the literal part, you can factor 
because it's the power of s with the smallest denominator. So, we have
taller, a 90% error??? I 'm not sure, but the first one I am sure.
Answer:
x = 125°, y = 55°, z = 70°
Step-by-step explanation:
x and 55 are adjacent angles and are supplementary, sum to 180°, that is
x + 55° = 180° ( subtract 55° from both sides )
x = 125°
∠ ABD and ∠ BDC are alternate angles and congruent , so
y = 55°
Since BD and BC are congruent, then Δ BCD is isosceles, so
∠ BDC = ∠ BCD = 55° and
z = 180° - (55 + 55)° ← angle sum of triangle
= 180° - 110°
= 70°
