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laraekeyes
26.09.2019 •
Mathematics
Nico is saving money for his college education. he invests some money at 6%, and $1600 less than that amount at 4%. the investments produced a total of $156 interest in 1 yr. how much did he invest at each rate?
he invested $ at 6% and $ at 4%.
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Ответ:
6% 4%
now... we dunno what "a" is, but nevermind, whatever that is, "b" invested at 4%, is 1600 less than that or less than "a", namely b = a - 1600
so.. "a" is the bigger amount than "b" by 1600, but no matter
what is 6% of a? well, 6/100 * a or 0.06a, that's how much it yielded
what is 4% of b? well, 4/100 * b, or 0.04b, that's much it earned in interests
we know, their yield, or total in earned interest is 156, so.. whatever those yields are, they add up to 156 or
0.06a + 0.04b = 156
now
solve for "a", to see how much was invested at 6%
how much is "b"? well, b = a - 1600
Ответ:
The stack is divided into 7 blocks that are 2 2/3 tall.
--> Second answer from bottom.
The next problem is a picture of a board that is 11 7/8 long. It is divided into 5 sections measuring 2 3/8 long.
-->3rd answer
Last problem is a picture of a rope that is 16 7/8 long. It is cut into 9 pieces that are 1 7/8 long.
--> 3rd answer