Phyllis invested 51000 dollars, a portion earning a
simple interest rate of 4 percent per year and the
rest earning a rate of 7 percent per year. After
one year the total interest earned on these
investments was 2850 dollars. How much money
did she invest at each rate?
At rate 4 percent:
Preview
At rate 7 percent:
Preview
Enter a mathematical expression more..]

d

step-by-step explanation:

d

answer: idk

step-by-step explanation:

we have three similar triangles, because each has a right angle and shares an angle.   let's write the angles in order: opposite to short leg, long leg, hypotenuse.

cab similar to bad similar to cbd

or as ratios,

ca: ab: cb = ba: ad: bd = cb: bd: cd

we also know

ac = ad + cd

(ad+cd): ab: cb = ba: ad: bd = cb: bd: cd

(ad+cd)/cb=cb/cd

we have cb=6, ad=5 and seek x=cd.

we reject the negative root and conclude x=4

answer: 4