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2 years ago

I don't know how to do math lol

Mathematics

2 answers:

ch4aika [34]2 years ago

5 0

Answer:

It's 9 and if I'm wrong I just copied the other guys answer soo

Step-by-step explanation:

Nimfa-mama [501]2 years ago

3 0

9514 1404 393

Answer:

(d) 9

Step-by-step explanation:

The relation you're supposed to apply here is ...

an exterior angle of a triangle is equal to the sum of the remote interior angles.

The exterior angle is 17x+7, and it is equal to the sum of the two marked angles inside the triangle.

17x +7 = 13x +3 +40

4x = 36 . . . . . . . . . . . . . subtract 13x+7 from both sides

x = 9 . . . . . . . . . divide both sides by 4

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3 years ago

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Y_Kistochka [10]

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3 years ago

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An arithmetic sequence has t1=5 and t2=8 find tn and sn

RoseWind [281]

Answer:

$a_n=2+3n$

$\displaystyle S_n=\frac{7n+3n^2}{2}$

Step-by-step explanation:

Arithmetic Sequences

The arithmetic sequences are identified because any term n is obtained by adding or subtracting a fixed number to the previous term. That number is called the common difference.

The equation to calculate the nth term of an arithmetic sequence is:

$a_n=a_1+(n-1)r$

Where

an = nth term

a1 = first term

r = common difference

n = number of the term

The sum of the n terms of an arithmetic sequence is given by:

$\displaystyle S_n=\frac{a_1+a_n}{2}\cdot n$

We are given the first two terms of the sequence:

a1=5, a2=8. The common difference is:

r = 8 - 5 = 3

Thus the general term of the sequence is:

$a_n=5+(n-1)3=5+3n-3=2+3n$

$\boxed{a_n=2+3n}$

The formula for the sum is:

$\displaystyle S_n=\frac{5+2+3n}{2}\cdot n$

$\displaystyle S_n=\frac{7+3n}{2}\cdot n$

Operating:

$\boxed{\displaystyle S_n=\frac{7n+3n^2}{2}}$

4 0

2 years ago

Need help with questions 23 & 25

BaLLatris [955]

23. You are expected to be familiar with the relationship

... cost + markup = selling price

a) cost + $23.99 = $119.95

... cost = $119.95 -23.99 = $95.96

b) The markup as a fraction of cost is

... markup/cost = $23.99/$95.96 = 0.25 = 25%

c) cost + markup = selling price . . . . the equation we started with

... cost/cost + markup/cost = (selling price)/cost . . . . divide by cost

... 100% + 25% = (selling price)/cost = 125%

25.

a) See part c) of problem 23. Selling price is 126% of cost.

b) Selling price = $450 × 1.26 = $567

c) Markup = $450 × 0.26 = $117

6 0

3 years ago

1Which extegory do both shapes belong to?

natka813 [3]

They are both Parallelograms, they both are 4 sided with the opposite being parallel

6 0

3 years ago

I don't know how to do math lol​

I don't know how to do math lol