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3 years ago

If five notebooks cost $5.25, how much would three notebooks cost? Show your work

Mathematics

2 answers:

nignag [31]3 years ago

6 0

Easy just do )5.25 +$5.25+$5.25 witch equals $15.75 YAY

Wewaii [24]3 years ago

4 0

The answer is 3.15 because if u divide 5.25 by 5 it equals 1.05 then u will multiply 1.05 x 3= 3.15

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Solve foR a12-3(a-1)=11+a

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Answer:

Solve for a

a12−3(a−1)=11+a

Write the problem as a mathematical expression.

a12−3(a−1)=11+a

Simplify each term.

a12−3a+3=11+a

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Step-by-step explanation:

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Step-by-step explanation:

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3 years ago

Please please help me

Gekata [30.6K]

Answer:

$\large\boxed{\dfrac{\boxed{8}}{81}}$

Step-by-step explanation:

$\text{If}\ a_1,\ a_2,\ a_3,\ a_4,\ ...,\ a_n\ \text{is the geometric sequence, then}\\\\\dfrac{a_2}{a_1}=\dfrac{a_3}{a_2}=\dfrac{a_4}{a_3}=...=\dfrac{a_n}{a_{n-1}}=constant=r-\text{common ration}.\\\\\text{We have}\ \dfrac{1}{2},\ \dfrac{1}{3},\ \dfrac{2}{9},\ \dfrac{4}{27},\ ...\\\\\dfrac{\frac{1}{3}}{\frac{1}{2}}=\dfrac{1}{3}\cdot\dfrac{2}{1}=\dfrac{2}{3}\\\\\dfrac{\frac{2}{9}}{\frac{1}{3}}=\dfrac{2}{9}\cdot\dfrac{3}{1}=\dfrac{2}{3}\\\\\dfrac{\frac{4}{27}}{\frac{2}{9}}=\dfrac{4}{27}\cdot\dfrac{9}{2}=\dfrac{2}{3}$

$\bold{CORRECT}\\\\\dfrac{x}{\frac{4}{27}}=\dfrac{2}{3}\qquad\text{multiply both sides by}\ \dfrac{4}{27}\\\\x=\dfrac{2}{3}\cdot\dfrac{4}{27}\\\\x=\dfrac{8}{81}$

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3 years ago