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3 years ago

Find S11 for 5 + 1 + (-3) + (-7) +…

Mathematics

2 answers:

ale4655 [162]3 years ago

7 0

Known :

a = 5

b = U2 - U1

= 1 - 5

= -4

Asked :

S11 = ...?

Answer :

Sn = n/2 (2a + (n-1) b)

S11 = 11/2 (2×5 + (11-1) (-4))

S11 = 11/2 (10 + 10 × (-4))

S11 = 11/2 (10 - 40)

S11 = 11/2 × (-30)

S11 = 11 × (-15)

S11 = -165

Hope it helpful and useful :)

gregori [183]3 years ago

3 0

The answer for this is -165

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A survey of sixth-grader students recorded how many hours students studied each week. The histogram below displays the collected

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Answer: I think 0 - 1.99 as there are 7 students, which is the highest amount of students in the histogram.

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2 years ago

Find the area of the shaded region. enter a decimal rounded to the nearest tenth

pav-90 [236]

Answer:

78.42

Step-by-step explanation:

Area of 360 - 80 degree region.

You need to find out the region of the major arc where the circle is almost complete. The area left over will be calculated later

Angle = 360 -80

Angle = 280 degrees.

Area = $\frac{angle*3.14*r^2}{360}$

Area = $\frac{280*3.14*5^2}{360}$

Area = 23800/360

Area = 66.11

Area of the Triangle with sides of 5 cm each

Here's where I get into a bit of trouble. I have to assume you know some trig.

Find the height

Cos(40) = The height / the hypotenuse

Cos(40) = h/5

0.7760 = h/5

h = 0.7760*5

h = 3.830

Find 1/2 the base (the chord of the circle)

Sin(40) = 1/2 base / hypotenuse

Sin(40) = 1/2 b / 5 Multiply both sides by 5

1/2 b = 5*sin(40) Find the sin(40)

1/2 b = 5*.6428 Combine the right

1/2 b = 3.139 multiply by 2

b = 6.4278

Find the area of the triangle

Area = 1/2 b * h

b = 6.4278

h = 3.830

Area = 1/2 * 6.4278*3.830

Area = 12.31 cm^2

Total Area

12.31 + 66.11 = 78.42

3 0

3 years ago

Read 2 more answers

THE SUM OF TWO INTEGERS WITH DIFFERENT SIGNS IS 8.GIVE TWO POSSIBLE INTEGERS THAT FIT THIS DESCRIPTION.

marusya05 [52]

Sum of two integers with different signs is equal to 8.

There are several answers:

+12 and -4
+10 and -2
+11 and -3

ETC.

6 0

4 years ago

Please help! Solve for y 3x - 7y + 12 = 5x - 9

belka [17]

Answer:

Step-by-step explanation:

3x - 7y + 12 = 5x - 9

-7y = 5x - 3x - 9 - 12

-7y = 2x - 21

7y = 2x + 21

y = 2/7x + 3

3 0

3 years ago

I ready scientific notation help

Airida [17]

The required value is $2\times10^9$

Step-by-step explanation:

Weight of ants = $4\times10^{-3}$

Weight of elephant= $8\times10^6$

We need to find, the total weight of about how many ants equals to the weight of an oversized elephant.

The equation given is:

$4\times10^{-3} \times a = 8\times10^6$

We need to find a:

Solving:

$4\times10^{-3} \times a = 8\times10^6\\a=\frac{8\times10^6}{4\times10^{-3}}\\if \,\,10^a/10^-b \,\,then\,\, 10^{a+b}\\a=2\times10^{6+3} \\a=2\times10^9$

So, the required value is $2\times10^9$

Keywords: Scientific Notation

Learn more about Scientific Notation at:

#learnwithBrainly

4 0

3 years ago