An engineer invested $10,000 in a six-month savings certificate that paid a simple annual interest rate of 12%. After six months she invested the total value of her investment in another six-month certificate. After six more months, the investment was worth $11.130. If the annual interest rate of the second certificate is r% then what is r? thank you!

Find the number of real number solutions for the equation. x2 + 5x + 7 = 0 0 cannot be determined 1 2

Ariana starts with 100 milligrams of a radioactive substance. the amount of the substance decreases by 20% each week for a number of weeks, w. the expression 100(1−0.2)w finds the amount of radioactive substance remaining after w weeks. which statement about this expression is true? a) it is the difference between the initial amount and the percent decrease. b) it is the difference between the initial amount and the decay factor after w weeks. c) it is the initial amount raised to the decay factor after w weeks. d) it is the product of the initial amount and the decay factor after w weeks.

What is the similarity ratio of a cube with volume 729m^3 to a cube with volume 3375 m^3