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2 years ago

14

Which expressions are equivalent to 71-x-3)? Select two options.

1 answer:

VikaD [51]2 years ago

8 0

Answer:

68-x

Step-by-step explanation:

71-x-3=71-3-x=68-x

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Calculate the arithmetic sequence in which a9=17 and the common difference is d=-2.1

jek_recluse [69]

Answer:

$S_{31}=71.3$

Step-by-step explanation:

The nth term of an arithmetic sequence is given by the formula,

$U_n=a_1+(n-1)d$

We were given that the 9th term is $17$ .

$\Rightarrow 17=a_1+(9-1)(-2.1)$

$\Rightarrow 17=a_1+(8)\times(-2.1)$

$\Rightarrow 17=a_1-\frac{84}{5}$

$\Rightarrow 17+\frac{84}{5}=a_1$

$\Rightarrow a_1=\frac{169}{5}$

The sum of the first n-terms is given by the formula,

$S_n=\frac{n}{2}(2a_1+(n-1)d)$

To find $S_{31}$ , we substitute $n=31$ , $a_1=\frac{169}{5}$ and $d=-2.1$ .

$\Rightarrow S_{31}=\frac{31}{2}(2(\frac{169}{5}+(31-1)(-2.1))$

$\Rightarrow S_{31}=\frac{31}{2}(2(\frac{169}{5}+(30)(-2.1))$

$\Rightarrow S_{31}=\frac{31}{2}(\frac{23}{5})$

$\Rightarrow S_{31}=\frac{713}{10}$

$\Rightarrow S_{31}=71.3$

The correct answer is D

8 0

3 years ago

Read 2 more answers

Am I correct? If so why?

babunello [35]

Answer: its correct

Step-by-step explanation: and its correct cuase its the answer you choose

7 0

2 years ago

PLS HELP!!!!!!!!!!!!!

stepladder [879]

First, multiply the top equation by 2 and bottom by -3.
60x+60y=900
-60x-75y=-1035
————————
-15y=-135
—————-
-15=-15
y=9

So the answer should be 9.

6 0

2 years ago

If the discriminant is positive there is exactly one real solution.

Len [333]

It is in form
0=ax^2+bx+c
0=-3x^2-2x+6
a=-3
b=-2
c=6

so
x=
x=
x=
x=
x=
x=
x= or

7 0

2 years ago

GUYS PLEASE HELP:<br><br> Evaluate the function <br> f (x) = 2x+6 for: <br><br> f(-19) =

Mariulka [41]

Answer:

-32

Step-by-step explanation:

f(x) = 2x + 6

f(-19) = 2*(-19) + 6

= -38 + 6

= -32

3 0

2 years ago

Read 2 more answers