One safe investment pays 10% per year and a more risky investment pays 18% per year. A woman has $145,600 to invest and would like to have an income of $20,000 per year from her investments. How much should she invest at each rate? a.) Write the necessary equations. b.) Convert the equations to coefficient and variable matrices. c.) Solve this problem using inverse matrices and find the inverse using the Gauss-Jordan Method. d.) How much should she invest at each rate.

(a) x+y=145600, 0.1x+0.18y=20000; (b) ; (c) x=$77600, y=$68000

Step-by-step explanation:

let x be the money she spent so that she can earn the free t-shirt.

since, she already spent $112.49

⇒

also, as per the statement: jennifer must spend $250 or more in order to qualify for a free t-shirt at the store.

then,

we have an inequality i.,e

subtract 112.49 from both sides we get;

therefore, $137. 51 more money does jennifer need to spend so that she can earn the free t-shirt

a 360 degree rotation

step-by-step explanation: