Calculate the discount and selling price. Marked Price Discount Amount of Discount Selling Price 1. $100 12% 2. $75 20% 3. $60 25% 4. $72.80 15% 5. $150 8% 6. $980 121⁄2% 7. $24.98 162⁄3% 8. $47.70 331⁄3%

Factor the trinomial below. 12x^2 - 32x - 12 a. 4(3x+3)(x-1) b. 4(3x+1)(x-3) c. 4(3x+6)(x-2) d. 4(3x+2)(x-6)

1. ∠1 is complementary to ∠2 and ∠3 is complementary to ∠2. subtraction property of equality 2. m∠1 + m∠2 = 90 and m∠3 + m∠2 = 90 substitution 3. m∠1 + m∠2 = m∠3 + m∠2 definition of complementary 4. m∠1 = m∠3 given

Which situation is an example of an observational study?