Step-by-step explanation:
28. a=422000 (1+12%)^8
=1044856.46
29 a=13000 (1+15%)^-5
=6463.29
30 a=1250 (1+8%)^11
=2914.548
using compound interest formula
Setup Average Equation:
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Average=Sum of our 4 numbers + unknown number of x
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Total Numbers
15 = 3 + 19 + 8 + 32 + x
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5
Cross Multiply
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3 + 19 + 8 + 32 + = 15 x 5
x + 62 = 75
Subtract 62 from both sides of the equation to isolate x:
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x + 62 - 62 = 75 - 62
x = 13
380*10⁹=3.8*10²*10⁹=3.8*10¹¹
