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wel
3 years ago
6

S=n/2(2a+(n-1)d). If d=5, n=13, S=585 find the value of a.​

Mathematics
1 answer:
anygoal [31]3 years ago
7 0

Answer:

15

Step-by-step explanation:

Sum of 'n' terms formula is given by:-    

s=n/2(2a+(n-1)d)  

s=13/2[2xa+(13-1)5]    

s=13/2(2xa+12x5)    

s=13/2(2a+60)    

585=13/2(2a+60)    

585 x (2/13) = 2a + 60

90 = 2a + 60  

90-60 = 2a

30 = 2a

a = 15

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Find the area of the parallelogram.
tensa zangetsu [6.8K]

Answer:

<h2>A = 210 cm²</h2>

Step-by-step explanation:

Area of a parallelogram = base × height

From the question

The base is = 30 cm

Let h represent the height of the parallelogram

We must first use Pythagoras theorem to find the height of the parallelogram before finding it's area

We have

{25}^{2}  =  {h}^{2}  +  {24}^{2}  \\  {h}^{2}  =  {25}^{2}  -  {24}^{2}  \\  {h}^{2}  =  \sqrt{ {25}^{2}  -  {24}^{2} }  \\  {h}^{2}  =  \sqrt{625 - 576}  \\  {h}^{2}  =  \sqrt{49}

We have the answer as

h = 7 cm

So from the question

height = 7cm

Let's substitute the base and the height into the above formula and solve for the area

We have

Area = 30 × 7

We have the final answer as

<h3>A = 210 cm²</h3>

Hope this helps you

5 0
3 years ago
Plz help! Giving a lot of points! :)
monitta
(B) carlos: 920 - 300 = 680
Rita: 980 - 375 = 680
(Sorry i could only answer B :(
5 0
2 years ago
Read 2 more answers
F(x)=3/x+2-√x-3 f(7)=
Paladinen [302]

Divide each term by x and simplify.

(Ok so I don’t make it confusing the first part after “F=“ will be on top The I’ll put the bottom part below oh btw the top and bottom r negative so put the negative sign in front of the fraction)

F= - 21fx+x√x-2x-3(top of fraction)

F=-x^2(bottom of fraction)

6 0
3 years ago
Which is greater than 4.026?<br><br> A. 4.020<br><br> B. 4.030<br><br> C. 4.021<br><br> D. 4.006
mote1985 [20]

Answer:

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Step-by-step explanation:

4 0
2 years ago
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A football quarterback enjoys practicing his long passes over 40 yards. He misses the first pass 40% of the time. When he misses
laila [671]

Answer:

Probability of missing two passes in a row is 0.08.

Step-by-step explanation:

Event E = A football player misses twice in a row.

P(E) = ?

Event X = Football player misses the first pass

P(X) = 0.4

Event Y = Football player misses just after he first miss

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Both the events are exclusive so the probability of occuring of these two events can be calculated by the formula:

P(E) = P(X).P(Y)

P(E) = 0.4*0.2

P(E) = 0.08

4 0
3 years ago
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