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3 years ago

Find the sum of the first 39 terms of the following series, to the nearest integer 7,15,23,...

Mathematics

1 answer:

sertanlavr [38]3 years ago

4 0

Answer:

6201

Step-by-step explanation:

formula for series in AP

where n is the nth term and a is first term and d is difference between two terms in series $sum = \frac{n}{2} (2a \: + (n - 1)d)$

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What is the square root of -15

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3 years ago

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How many solutions does the following system of equations have?<br> 2y= 5x + 4<br> 1 = 3x + 2

Elden [556K]

Looks like a pretty regular system, no parallel lines. In fact the second equation is a vertical line as written; not sure if that's a typo. Either way,

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3 years ago

What is 1230*456

Marta_Voda [28]

Answer:

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Step-by-step explanation:

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3 years ago

What is the total surface area

Stels [109]

We have two right triangles and three different rectangles.

The formula of an area of a right triangle:

$A_T=\dfrac{1}{2}l_1l_2$

l₁, l₂ - legs

We have l₁ = 20cm and l₂ = 21cm. Substitute:

$A_T=\dfrac{1}{2}(20)(21)=(10)(21)=210\ cm^2$

The formula of an area of a rectangle:

$A_R=lw$

l - length

w - width

We have:

rectangle #1: l = 22cm, w = 29cm

$A_{R1}=(22)(29)=638\ cm^2$

rectangle #2: l = 22cm, w = 21cm

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rectangle #3: l = 22cm, w = 20cm

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The total Surface Area of the triangular prism:

$S.A.=2A_T+A_{R1}+A_{R2}+A_{R3}\\\\S.A.=2\cdot210+638+462+440=1960\ cm^2$

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3 years ago

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marishachu [46]

Answer:

Step-by-step explanation:

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