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arlik [135]
2 years ago
7

When 8 is added to a certain number and the

Mathematics
1 answer:
Mars2501 [29]2 years ago
7 0

Answer:

11

Step-by-step explanation:

11+8=19

19x3=57

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(X+2y)(x-2y) how do I solve this
Fudgin [204]

Step-by-step explanation:

(x+2y)(x-2y)

  • x^2-2xy+2xy-(2y)^2
  • x^2-4y^2

5 0
3 years ago
Multiply / Divide Radical Expressions<br> i need help please.
slava [35]

Answer:

2 with the sqaure root of 12 is = 6.9     simp =  6.9

4 with the sqaure root of 10 is = 12.6    simp= 12.6

sum = 19.5

I hoped this helped! :)

5 0
3 years ago
Evaluate 2x2y3 when x=2\3 and y=1\2
Evgesh-ka [11]

Answer:

The answer is 4

Step-by-step explanation:

2(2/3)2(1/2)3

5 0
2 years ago
11. What is the value of x in the figure at the right? (Examples 3 and 4)
natka813 [3]

Answer:

x = 11

Step-by-step explanation:

  • Vertically opposite angles are equal
  • Angles around a point add up to 360°

Therefore, 15x + 15x + 15 + 15 = 360

\implies 30x+30=360

\implies 30x=330

\implies x=11

6 0
2 years ago
ILL GIVE BRAINLIEST! PLEASE HELP I DONT UNDERSTAND!
blsea [12.9K]

Answer:

S₁₅ = 645

Step-by-step explanation:

The sum to n terms of an arithmetic sequence is

S_{n} = \frac{n}{2} [ 2a₁ + (n - 1)d ]

where a₁ is the first term and d the common difference

Using the nth term formula a_{n} = 5n + 3 , then

a₁ = 5(1) + 3 = 5 + 3 = 8

a₂ = 5(2) + 3 = 10 + 3 = 13 , then

d = a₂ - a₁ = 13 - 8 = 5

Thus

S₁₅ = \frac{15}{2} [ (2 × 8) + (14 × 5) ]

     = 7.5( 16 + 70)

     = 7.5 × 86

     = 645

7 0
2 years ago
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