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andreev551 [17]

2 years ago

6

0.7(2.7 + 2f) simplify the expression?

1 answer:

Dafna1 [17]2 years ago

6 0

Answer:

1.89+1.4f

Step-by-step explanation:

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Gabriela has taken 33 quizzes and her average score so far is 8080. if she gets 100100, a perfect score, on the remaining 22 qui

allochka39001 [22]

Her average will be 100078

7 0

3 years ago

Which of the following expressions has 3 terms? <br> 8x + y - z <br> xyz <br> y3 + 1

Dmitry [639]

8x + y - z

You can tell because each term is separated by an operator such as +, -, *, or /

8 0

3 years ago

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1.75 grams x 1000 milligrams/ 1 g

Paul [167]

Convert the milligrams into grams

1,000 milligrams = 1 gram

so 1.75 grams X 1 gram/1 gram = 1.75 X 1 = 1.75 grams

hope that helps :)

7 0

3 years ago

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

Please help as soon as possible

Studentka2010 [4]

The lines are reciprocal because they cross to form an X. Also 4/5 is the reciprocal of 5/4

4 0

2 years ago

Read 2 more answers