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3 years ago

What is the answer for y=-1\2x+3 if x is -4

Mathematics

2 answers:

Liula [17]3 years ago

8 0

The answer is y=5 because -.5x-4=2 and 2 +3=5

mote1985 [20]3 years ago

4 0

You should multiply -4 times 2 and you'd get -8 divide that by 1 it's still-8 add it by 3 you get -5

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1Ox+6-8x=9x +12-8x-2

Goshia [24]

Answer:

X=4

Step-by-step explanation:

3 0

3 years ago

Determine formula of the nth term 2, 6, 12 20 30,42

nalin [4]

Check the forward differences of the sequence.

If $\{a_n\} = \{2,6,12,20,30,42,\ldots\}$ , then let $\{b_n\}$ be the sequence of first-order differences of $\{a_n\}$ . That is, for n ≥ 1,

$b_n = a_{n+1} - a_n$

so that $\{b_n\} = \{4, 6, 8, 10, 12, \ldots\}$ .

Let $\{c_n\}$ be the sequence of differences of $\{b_n\}$ ,

$c_n = b_{n+1} - b_n$

and we see that this is a constant sequence, $\{c_n\} = \{2, 2, 2, 2, \ldots\}$ . In other words, $\{b_n\}$ is an arithmetic sequence with common difference between terms of 2. That is,

$2 = b_{n+1} - b_n \implies b_{n+1} = b_n + 2$

and we can solve for $b_n$ in terms of $b_1=4$ :

$b_{n+1} = b_n + 2$

$b_{n+1} = (b_{n-1}+2) + 2 = b_{n-1} + 2\times2$

$b_{n+1} = (b_{n-2}+2) + 2\times2 = b_{n-2} + 3\times2$

and so on down to

$b_{n+1} = b_1 + 2n \implies b_{n+1} = 2n + 4 \implies b_n = 2(n-1)+4 = 2(n + 1)$

We solve for $a_n$ in the same way.

$2(n+1) = a_{n+1} - a_n \implies a_{n+1} = a_n + 2(n + 1)$

Then

$a_{n+1} = (a_{n-1} + 2n) + 2(n+1) \\ ~~~~~~~= a_{n-1} + 2 ((n+1) + n)$

$a_{n+1} = (a_{n-2} + 2(n-1)) + 2((n+1)+n) \\ ~~~~~~~ = a_{n-2} + 2 ((n+1) + n + (n-1))$

$a_{n+1} = (a_{n-3} + 2(n-2)) + 2((n+1)+n+(n-1)) \\ ~~~~~~~= a_{n-3} + 2 ((n+1) + n + (n-1) + (n-2))$

and so on down to

$a_{n+1} = a_1 + 2 \displaystyle \sum_{k=2}^{n+1} k = 2 + 2 \times \frac{n(n+3)}2$

$\implies a_{n+1} = n^2 + 3n + 2 \implies \boxed{a_n = n^2 + n}$

6 0

2 years ago

Using the technique in the model above, find the missing sides in this 30°-60°-90° right triangle.

ale4655 [162]

Umm..... according to what I know The ratio of the sides of a 30°-60°-90° triangle are:
short leg : long leg : hypotenuse
1 : √3 : 2
 if the short leg is 7, the long leg is √3 times that:
Answer:
7√3 ≈ 12.12 inches

8 0

3 years ago

Read 2 more answers

How i can answer this question, NO LINKS, if you answer correctly i will give u brainliest!

Natalka [10]

Answer:

Step-by-step explanation:

x^2.x^1

=9^2.9^1

= 9 multiplied by 9

=81

9 multiplied by 1

81 multiplied by nine

=585.198599

6 0

2 years ago

Please answer quickly! What contributed to the environmental damage that resulted in the Dust Bowl?

Elina [12.6K]

A, B, E, and F all contribute to the Dust Bowl.

5 0

3 years ago

Read 2 more answers