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Elden [556K]
2 years ago
13

the sum of the 10th and 11th terms of an arithmetic sequence is 65 what is the sum of its first 20th terms​

Mathematics
1 answer:
Dmitriy789 [7]2 years ago
6 0

Answer:

this is the answer

Step-by-step explanation:

a 65

b 650

c 52

d 3

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The object below is made of solid plastic. It is a cylinder with an indentation at the top in the shape of a cone. What is the v
Anastasy [175]

Answer:

97.6 cm³

Step-by-step explanation:

Volume of plastic object :

Volume of cylinder - volume of cone

From. The diagram. :

Radius, r = diameter /2 = 4/2

Volume of cylinder = pi*r²h

V = 22/7 * 2² * 8 = 100.53096 cm³

Volume of cone = 1/3*pi*r²h

V = 1/3 * 22/7 * 2² * 8

V = 2.9321531 cm³

(100.53096 - 2.9321531) cm³

= 97.598 cm³

= 97.6 cm³

5 0
2 years ago
1. Kristen spent $131 on shirts at Target last week. She bought some fancy shirts for
Masja [62]

Answer:

Kristen bought 2 fancy shirts and 5 plain t-shirts.

Step-by-step explanation:

Given that,

Kristen spent $131 on 7 shirts.

Cost of one fancy shirt = $28

Cost of one plain t-shirt = $15

Let,

x be the number of fancy shirts

y be the number of plain t-shirts

x+y = 7       Eqn 1

28x+15y=131    Eqn 2

Multiplying Eqn 1 by 15

15(x+y=7)

15x+15y=105    Eqn 3

Subtracting Eqn 3 from Eqn 2

(28x+15y)-(15x+15y)=131-105

28x+15y-15x+15y=26

13x=26

Dividing both sides by 13

\frac{13x}{13}=\frac{26}{13}\\x=2

Putting x=2 in Eqn 1

2+y=7

y=7-2

y=5

Hence,

Kristen bought 2 fancy shirts and 5 plain t-shirts.

3 0
3 years ago
Start with the point A (3, 1). Translate the point 1 unit to the left and 4 units down. What are the new coordinates of the poin
Over [174]

This is the transformations: See the picture, here we find the coordinate:

A' = (2,-3) and A''=(0.5,-2). There is many ways to get back to A from A'', i have showed one way (the red lines). This is done by going 5 units right and then 6 units up.

see image at https://imgur.com/a/fWQl8



3 0
2 years ago
5 divided by 465 please give the answer
Andreas93 [3]

Answer:

0.11111....

Step-by-step explanation:

. ......... .....

wait I was wrong

8 0
2 years ago
If I have the full price of an item, & the discounted price of the same item, how do I find the discount percentage?
melamori03 [73]

Answer:

Subtract the discount price from the full price. Divide the amount of change by the original price.

Step-by-step explanation:

Example: Original price = $40 Sale price = $30

$40-$30= 10

10/40= 1/4

1/4 = .25 or 25%

5 0
3 years ago
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