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vovangra [49]
3 years ago
5

(ab - 9)(ab + 8) Please answer.

Mathematics
1 answer:
WINSTONCH [101]3 years ago
3 0

\text{Use FOIL method:}\ (a+b)(c+d)=ac+ad+bc+bd\\\\(ab-9)(ab+8)=(ab)(ab)+(ab)(8)+(-9)(ab)+(-9)(8)\\\\=a^2b^2+8ab-9ab-72\\\\=\boxed{a^2b^2-ab-72}

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Answer:

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Step-by-step explanation:

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2 years ago
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Martin deposits $200 in a savings account that earns 5% annual interest. four years later, cary deposits $200 in an account earn
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<span>Martin deposits $200 in a savings account that earns 5% annual interest.

year         interest                       balance

1              200 * 5%                    200(1.05)

2              200(1.05) * 5%          200(1.05)^2

3              200(1.05)^2*5%        200(1.05)^3

y                                                200(1.05)^y

=> m = 200 (1.05)^y

four years later, cary deposits $200 in an account earning the same interest.

</span>
<span><span>year         interest                       balance

5              200 * 5%                    200(1.05)

6              200(1.05) * 5%          200(1.05)^2

7             200(1.05)^2*5%        200(1.05)^3

y                                                200(1.05)^(y-4)

=> c = 200(1.05)^ (y-4)
</span>
Answer:
Martin: 200(1.05)^y
Cary: 200(1.05)^(y–4)
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3 0
3 years ago
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You decide to put the Gamer table on sale for 20% off. You normally charge $210 for this table. What is the amount of the discou
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First, you would multiply $210 by 20%
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Answer:

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Step-by-step explanation:

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