# I am having dificulty using formulas in week one of my math course

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I am having dificulty using formulas in week one of my
math course. One question is as follows. A person hired a
firm to build a CB tower. The firm charges \$100 for labor
for the first 10 feet; after that , the cost of labor goes up 25
for each additional 10 feet....\$125 for the second 10 feet
and \$150 for the third and so on. How much will it cost to
make a 90 foot tower. Coming up with the answer is self
explanatory, but using a formula is the problem. I have to
use an = a1 + (n-) d. I need help. I dont understand this at
all.
Solution
first find \'n\'
To find n, you can divide height of tower/each increment
so, n=90/10=9
a=100(starting value)
d=25
tn=100+(9-1)*25
tn=100+25*8
tn=100+200
tn=300

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I am having dificulty using formulas in week one of my math course. One question is as follows. A person hired a firm to build a CB tower. The firm charges \$100 for labor for the first 10 feet; after that , the cost of labor goes up 25 for each additional 10 feet....\$125 for the second 10 feet and \$150 for the third and so on. How much will it cost to make a 90 foot tower. Coming up with the answer is self explanatory, but using a formula is the problem. I have to use an = a1 + (n-) d. I need help. I dont understand this at all. Solution first find \'n\' To find n, you can divide height of t ...
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