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3 years ago

6

How do you subtract -2 from 3

1 answer:

Aliun [14]3 years ago

4 0

1) so soo si Suu si sh Djibouti Di RI du du sh sh sh db dc xv CNN CNN b b hm

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Evaluate S5 for 300 + 150 + 75 + … and select the correct answer below. 18.75 93.75 581.25 145.3125

Savatey [412]

we have that

$300 + 150 + 75 +...$

Let

$a1=300\\ a2=150\\ a3=75$

we know that

$\frac{a2}{a1} =\frac{150}{300} \\\\ \frac{a2}{a1}=0.5 \\ \\ a2=a1*0.50$

$\frac{a3}{a2} =\frac{75}{150} \\\\ \frac{a3}{a2}=0.5 \\ \\ a3=a2*0.50$

so

$a(n+1)=an*0.50$

Is a geometric sequence

Find the value of $a4$

$a(4)=a3*0.50$

$a(4)=75*0.50$

$a(4)=37.5$

Find the value of $a5$

$a(5)=a4*0.50$

$a(5)=37.5*0.50$

$a(5)=18.75$

Find $S5$

$S5=a1+a2+a3+a4+a5\\ S5=300+150+75+37.5+18.75\\ S5=581.25$

therefore

the answer is

$581.25$

Alternative Method

Applying the formula

$S_n=\frac{a_1 (1-r^n)}{1-r} \\\\a_1=300 \\ r=\frac{1}{2}\\\\ S_5=\frac{300(1-(\frac{1}{2})^5)}{1-\frac{1}{2}}\\\\=\frac{300(1-\frac{1}{32})}{\frac{1}{2}}\\\\=\frac{300 \times \frac{31}{32}}{\frac{1}{2}}\\\\=\frac{75 \times \frac{31}{8}}{\frac{1}{2}}\\\\=\frac{\frac{2325}{8}}{\frac{1}{2}}\\\\=\frac{2325}{8} \times 2\\\\=\frac{2325}{4}\\\\=581 \frac{1}{4}\\\\=581.25$

therefore

the answer is

$581.25$

6 0

3 years ago

Read 2 more answers

I'm so confused, pls help

Vera_Pavlovna [14]

Answer:

x = 14 D

Step-by-step explanation:

(18x + 36) / 3 = 6x + 12

6x + 12 = -16 + 8x

-6x . -6x

12 = -16 + 2x

+16 . +16

28 = 2x

/2 . /2

14 = x

8 0

2 years ago

Use the relationship between the angles in the figure to answer the question.

Galina-37 [17]

Answer:

The answer is the option $x+49\°+28\°=180\°$

Step-by-step explanation:

see the attached figure with letters to better understand the problem

we know that

$m$

$m$ -----> by vertical angles

$m$ -----> given problem

$m$ -----> given problem

substitute

$28\°+x+49\°=180\°$

5 0

3 years ago

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Pleas hlp am going to fail here are the options

Mrac [35]

I think it is b hope it helps

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2 years ago

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Len [333]

Answer:

0.058863

Step-by-step explanation:

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2 years ago