A sand dune stands 5 feet above sea level. The hill is eroding at a rate of 1 foot per 20 years. Let y represent the height of the sand dune after x years. Which equation represents the situation?
0 x = -1
X-5
O y=-2x+5
O y=-20x-5
O y=-20x+5

Which ordered pair is a solution to the system of linear equations? 2x + 3y= 6 –3x + 5y = 10

The volume of a sphere is increased by 6%. calculate the corresponding percentage increased in it area.

Which sum or difference identity would you use to verify that cos (180° - q) = -cos q? a.) sin (a -b) = sin a cos b – cos a sin b b.) cos (a -b) = cos a cos b – sin a sin b c.) cos (a -b) = cos a cosb + sin a sin b d.) sin (a + b) = sin a cos b + cos a sin b