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3 years ago

13

Help me with this pls

1 answer:

Alecsey [184]3 years ago

5 0

Answer:

$3.17

Step-by-step explanation:

3 soft drinks at $2.50 each → 3 x $2.50 = $7.50

3 soft drinks + 3 candy bars = $16.50

$7.50 + 3 candy bars = $16.50

3 candy bars = $9.50

1 candy bar = $9.50/3 = $3.17 (3s.f.)

this is a question on forming and solving equations. If you wish to explore more into this topic you can give me a follow on Instagram (learntionary) I'll be posting the notes for several topics and some tips as well!

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Plz help me I really need help

swat32

Answer:

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Step-by-step explanation:

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3 years ago

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Find S12 for geometric series: (-7.5) + 15 + (-30) + ...

kolezko [41]

Answer:

S12 for geometric series: (-7.5) + 15 + (-30) + ... would be: 10237.5

Step-by-step explanation:

Given the sequence to find the sum up-to 12 terms

$(-7.5) + 15 + (-30) + ...$

As we know that

A geometric sequence has a constant ratio 'r' and is defined by

$a_n=a_1\cdot r^{n-1}$

$\mathrm{Compute\:the\:ratios\:of\:all\:the\:adjacent\:terms}:\quad \:r=\frac{a_{n+1}}{a_n}$

$\frac{15}{\left(-7.5\right)}=-2,\:\quad \frac{\left(-30\right)}{15}=-2$

$\mathrm{The\:ratio\:of\:all\:the\:adjacent\:terms\:is\:the\:same\:and\:equal\:to}$

$r=-2$

$\mathrm{The\:first\:element\:of\:the\:sequence\:is}$

$a_1=\left(-7.5\right)$

$a_n=a_1\cdot r^{n-1}$

$\mathrm{Therefore,\:the\:}n\mathrm{th\:term\:is\:computed\:by}\:$

$a_n=\left(-7.5\right)\left(-2\right)^{n-1}$

$a_n=-\left(-2\right)^{n-1}\cdot \:7.5$

$\mathrm{Geometric\:sequence\:sum\:formula:}$

$a_1\frac{1-r^n}{1-r}$

$\mathrm{Plug\:in\:the\:values:}$

$n=12,\:\spacea_1=\left(-7.5\right),\:\spacer=-2$

$=\left(-7.5\right)\frac{1-\left(-2\right)^{12}}{1-\left(-2\right)}$

$=-7.5\cdot \frac{1-\left(-2\right)^{12}}{1+2}$

$\mathrm{Multiply\:fractions}:\quad \:a\cdot \frac{b}{c}=\frac{a\:\cdot \:b}{c}$

$=-\frac{-30712.5}{1+2}$ ∵ $\left(1-\left(-2\right)^{12}\right)\cdot \:7.5=-30712.5$

$=-\frac{-30712.5}{3}$

$=\frac{30712.5}{3}$

$=10237.5$

Thus, S12 for geometric series: (-7.5) + 15 + (-30) + ... would be: 10237.5

5 0

3 years ago

23. Tara is driving 30 miles per hour. How long will it take her to travel 60 miles?

lys-0071 [83]

Answer:

2 hours

Step-by-step explanation:

30×1=30

30×2=60

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3 years ago

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damaskus [11]

I would have to say 32,4 but i would double check it

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3 years ago

When exchanging from your currency to another country's currency using a foreign exchange table, you should

Ray Of Light [21]

When exchanging from your currency to another country's currency using a foreign exchange table, you should <span>multiply the amount you have by the exchange rate. The correct option among all the options that are given in the question is the first option. I hope that this answer has come to your help.</span>

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3 years ago

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