3 years ago

50 points i neeeeeed help

Mathematics

1 answer:

viktelen [127]3 years ago

7 0

Answer:

B. a₁ = -6, aₙ = aₙ₋₁ + 4

Step-by-step explanation:

From the given sequence we see that:

Common difference is 4

Find the first term:

a₁ + 3*4 = a₄
a₁ + 12 = 6
a₁ = -6

The recursive formula for this sequence is:

a₁ = -6, aₙ = aₙ₋₁ + 4

Correct choice is B

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3x + y = 17 4x - y = 18

Inessa05 [86]

The two equations given are
3x + y = 17 and 4x - y = 18
Now we will first take one equation
3x + y = 17
Then
y = 17 - 3x
Now replacing the value of y in the second equation we get
4x - y = 18
4x - (17 - 3x) = 18
4x + 3x - 17 = 18
7x = 35
x = 35/7
= 5
Putting the value of x in the first equation we get
3x + y = 17
(3 * 5) + y = 17
15 + y = 17
y = 17 - 15
y = 2
So the value of x is 5 and y is 2

5 0

4 years ago

Read 2 more answers

A, B & C form a triangle where ∠ BAC = 90°. AB = 13.5 mm and CA = 3.2 mm. Find the length of BC, giving your answer rounded

adelina 88 [10]

Answer:

13.9

Step-by-step explanation:

Use Pythagorean Theorem:

Both of the lengths given are the legs,

13.5^2 + 3.2^2 = c^2

182.25 + 10.24 = c^2