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Maksim231197 [3]
3 years ago
5

Timothy bought concrete mix for several projects. He used 3.5 bags of concrete mix for a new set of stairs and 2.25 bags of conc

rete mix for a garden wall. Timothy mixed 345 pounds of concrete in all. Answer parts a and b
Mathematics
2 answers:
Fiesta28 [93]3 years ago
8 0

Answer: 3.5y + 2.25y =345

Step-by-step explanation:

lapo4ka [179]3 years ago
4 0

Answer:

Step-by-step explanation:

44

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Find an explicit rule for the nth term of the sequence.The second and fifth terms of a geometric sequence are 18 and 144, respec
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Given:

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Hence, we have:

\begin{gathered} \text{ar}^{2-1}\text{ = 18} \\ ar\text{ = 18} \\  \\ ar^{5-1}=\text{ 144} \\ ar^4\text{ =144} \end{gathered}

Divide the expression for the fifth term by the expression for the second term:

\begin{gathered} \frac{ar^4}{ar}\text{ = }\frac{144}{18} \\ r^3\text{ = }\frac{144}{18} \\ r\text{ = 2} \end{gathered}

Substituting the value of r into any of the expression:

\begin{gathered} ar\text{ =  18} \\ a\text{ }\times\text{ 2 =  18} \\ Divide\text{ both sides by 2} \\ \frac{2a}{2}\text{ =}\frac{18}{2} \\ a\text{ = 9} \end{gathered}

Hence, the explicit rule for the sequence is:

a_n\text{ = 9\lparen2\rparen}^{n-1}

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1 year ago
Is the centre of a circle always equal distance from all points on the circumference? and why
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Answer:

Yes, the center of a circle is always and always equidistant from all the points on circumference because that is because what a circle is called. The distance from the center of the circle to the circumference is called the radius and it is constant for any particular circle.

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