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erastovalidia [21]
3 years ago
11

The first term of an AP is 2 and the

Mathematics
1 answer:
yanalaym [24]3 years ago
7 0

Answer:

Sn = n/2[2a + (n-1)d]

n=11

a=2

d=3

Sn= 11/2[2(2) + (11-1)3]

Sn= 11/2(34)

Sn = 11x17

=187.

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13.
Artist 52 [7]

Answer:

5 units

Step-by-step explanation:

An isosceles triangle is a triangle with two legs that have the same length. The perimeter of a triangle is the sum of the lengths of all sides of the triangle. Now taking this into account, we know that:

2L + B = 14 units

Where:

L is the measure of one leg

B is the measure of the base

Since two legs are the same and the base is 1 less, this means the measure of each leg would be:

B = L -1

Now we have two equations:

2L + B = 14 units

B = L- 1

We plug one equation into the other and make 1 equation:

2L + (L-1) = 14 units

Get rid of the parentheses:

2L + L - 1 = 14

Combine like terms:

3L - 1 = 14

Add 1 to both sides of the equation:

3L - 1 + 1 = 14 + 1

3L = 15

Divide both sides by 3:

3L/3 = 15/3

L = 5

So the length of a leg is 5 units

Let's check!

B = L - 1

B = 5 - 1

B = 4

Then we use that to solve for the perimeter:

2L + B

2(5) + 4

10 + 4 = 14

7 0
3 years ago
Simplify the expression. 6(7n – 5m) + 8m
borishaifa [10]
6(7n – 5m) + 8m
42n - 30m + 8m
42n -22m
Answer: 42n-22m

7 0
3 years ago
Read 2 more answers
The sum of 2 rational numbers is 5/2. if one of the number is -7/3. then find the other number.
serg [7]

Answer:

can you help me on myquestio

Step-by-step explanation:

6 0
3 years ago
Read 2 more answers
What type of triangle is this triangle?
Westkost [7]

Answer:

Obtuse scalene

Step-by-step explanation:

6 0
2 years ago
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Paul is going to install tiles on the floor of a swimming pool. The swimming pool is 15 meters long by 7 meters wide. A tile cos
irakobra [83]
So we know that the swimming pool is 15 by 7 meters wide. 
15 times 7 is 105.
Now, a tile costs $6 and covers 1 square meter. 
So, we should multiply 105 by 6, which would give us 630.

So, if I'm correct, the answer should be that it costs him $630 to install the tiles on the swimming pool.
(sorry if I'm incorrect)
5 0
3 years ago
Read 2 more answers
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