Robert invests $1,100 at an annual interest rate of 8% for the period of 1 year. right an equation that shows the relationship between principal amount (p), rate of interest (r), period of investment in years (t), and interest earned (i).

i=1,100*0.08*1-equation

$88-interest earnt

Step-by-step explanation:

I=prt- interest rate formula

i=1,100*0.08*1---this is your equation

i=88

the interest earnt is $88

hope this helps!

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step-by-step explanation:

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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