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jekas [21]
3 years ago
12

HELP

Mathematics
1 answer:
Xelga [282]3 years ago
8 0

Answer:

21x^2+3x+12

Step-by-step explanation:

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Which of the following statements shows the inverse property of addition?
Kaylis [27]

Answer:

a+(-a)=0

Step-by-step explanation:

Let a\in \mathbb R, that is a be any real number.

The inverse property of addition says that, the sum of a number a and its additive inverse -a gives the identity element of addition which is zero.

That is :

a+(-a)=0

We can rewrite this as -a+a=0

From the above options, we have the correct answer to be the first choice

3 0
3 years ago
What is the sum of the infinite geometric series? Sigma-Summation Underscript n = 1 Overscript 3 EndScripts (1.3) (.8) Superscri
Nimfa-mama [501]

Answer:

<h2>6.5</h2>

Step-by-step explanation:

Given the sum of the series represented as \sum\left {3} \atop {1}} \right (1.3)(0.8)^{n-1}. <u>To get the sum to infinity of the geometric series, we need to get its first term and its common ratio</u>. comparing to the general term of the sum of series of a GP \sum\left {n} \atop {1}} \right (a)(r)^{n-1}

a = first term of the series

r = common ratio

On comparing to the given series, a = 1.3 and r = 0.8

Sum to infinity of a Geometric series is expressed as:

S_ \infty =\frac{a}{1-r}\\ S_ \infty =\frac{1.3}{1-0.8}\\S_ \infty =\frac{1.3}{0.2}\\S_ \infty = 6.5

6 0
3 years ago
Someone help please, i cant solve this one :|
andrey2020 [161]

Answer:

i think its B

Step-by-step explanation:

4 0
3 years ago
Read 2 more answers
Find the equation of the straight line which passes through the point (-1,3) and make intercept on x - axis as thrice that on y
Triss [41]

Answer:

y = -\frac{1}{3}x + \frac{8}{3}

Step-by-step explanation:

Given

(x_1,y_1) = (-1,3)

Intercept\ on\ x-axis = Intercept\ on\ y-axis.

Required

Determine the equation

First, we calculate the intercepts using:

\frac{x}{a} + \frac{y}{b} = 1

Where

b = Intercept on y axis.

a = Intercept on x axis.

From the question:

a = 3b

The equation becomes:

\frac{x}{3b} + \frac{y}{b} = 1

Multiply through by 3b

x + 3y  = 3b

We have: (x_1,y_1) = (-1,3)

So:

-1 + 3 * 3 = 3b

8 = 3b

Make b the subject

b = \frac{8}{3}

Substitute b = \frac{8}{3} in x + 3y  = 3b to get the equation

x + 3y = 3 * \frac{8}{3}

x + 3y = 8

Make 3y the subject

3y = -x + 8

Make y the subject

y = -\frac{1}{3}x + \frac{8}{3}

5 0
3 years ago
39 lies between what two integers?
Vlada [557]

Answer:

6 and 7 for the square root or 38 and 40 im not sure on which by the wording being very low standard

4 0
4 years ago
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