2 years ago

How many dots are in the 15th step

Mathematics

1 answer:

andreyandreev [35.5K]2 years ago

3 0

21 i think if its wrong then sorry

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Please help!! See the attachment, please!

topjm [15]

Answer:

$946$

Step-by-step explanation:

we know that

The formula to find the sum is equal to

$S=(a1+an)n/2$

where

a1 is the first term

an is the last term

n is the number of terms

In this problem we have

$n=11$

$a1=(98-2(1))=96$

$an=(98-2(11))=76$

substitute the values in the formula

$S=(96+76)(11/2)=946$

5 0

4 years ago

jeffrey purchased a card for $180 that gives him 20 visits to a new gym and includes a one-time fee for unlimited use of the sau

yawa3891 [41]

There is many ways to do this but i did it this way.

180-123.75= 56.25

56.25/5=11.25

=11.25

7 0

4 years ago

Read 2 more answers

2x2 - 12x + 10<br>what are the roots

Tcecarenko [31]

Answer:

5 & 1

Step-by-step explanation:

We can use the quadratic formula to solve this:

Quadratic Formula = $\frac{-b+-\sqrt{b^2-4ac} }{2a}$

So we will have 2 answers (roots).

a is the coefficient of x^2 (2)

b is the coefficient of x (-12)

c is the constant (10)

Now, substituting, we get:

x = $\frac{-b+-\sqrt{b^2-4ac} }{2a}=\frac{12+-\sqrt{(-12)^2-4(2)(10)} }{2(2)}=\frac{12+-\sqrt{64} }{4}=\frac{12+-8}{4}=\frac{12+-8}{4}=5,1$

Hence the roots are 5 & 1

4 0

3 years ago

Write an equation of the line that passes through the point (2, 3) and is perpendicular to the line x = -1.

Sedbober [7]

Answer:

B)Y=3

Step-by-step explanation:

7 0

3 years ago

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There are 20 sweets in a packet. The sweets are either red or blue. 12 of the sweets are red.

Dmitrij [34]

A)3/5
I'm not sure about the other, not too good with ratios.

6 0

3 years ago

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