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antiseptic1488 [7]
3 years ago
9

Melanie sold half of her comic books and then bought 7 more. She now has 18. How many did she begin with?

Mathematics
2 answers:
lianna [129]3 years ago
8 0
18-7=11
11x2=22

Melanie started with 22 comic books.
Alekssandra [29.7K]3 years ago
6 0

she began with 22 comic books

18-7=11

11+11=22

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Answer:

f(1) = 2

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Step-by-step explanation:

the point of coordinates (1 , 2) is on the graph

Then

f(1) = 2

…………………………

We notice that :

f(2) = 4

f(3) = 8

f(4) = 16

16/8 = 8/4 = 4/2 = 2/1 = 2

________________________

This means the common ratio

of the geo sequence = 2

Hence ,

f(n) = 2 × f(n - 1)

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How to find the θ in this equation: tan(θ+16°)=1/tan(θ+60°) by using the trigonometric identities?thanks
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Answer:

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Step-by-step explanation:

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Read 2 more answers
Given that for an arithmetic sequence, the first term is q and the second term is qz.
otez555 [7]

Answer:

d = q(z-1)

S_n = \frac{nq}{2}(2 + (n-1)(z-1))

S_{10} = 5q(9z -7)

Step-by-step explanation:

Given

T_1 = q

T_2 = qz

Solving (a1): The common difference (d)

d is calculated as

d  = T_2 - T_1

This gives:

d  = qz - q

Factorize:

d = q(z-1)

Solving (a2): Sum of n terms

This is calculated using:

S_n = \frac{n}{2}(2*T_1 + (n-1)d)

Substitute values for T1 and d

S_n = \frac{n}{2}(2*q + (n-1)q(z-1))

S_n = \frac{n}{2}(2q + q(n-1)(z-1))

Factorize:

S_n = \frac{n}{2}(q(2 + (n-1)(z-1)))

S_n = \frac{nq}{2}(2 + (n-1)(z-1))

Solving (b): Sum of first 10.

In this case, n = 10

So:

S_n = \frac{nq}{2}(2 + (n-1)(z-1))

becomes

S_{10} = \frac{10 * q}{2}(2 + (10-1)(z-1))

S_{10} = 5 * q(2 + 9(z-1))

S_{10} = 5q(2 + 9(z-1))

S_{10} = 5q(2 + 9z-9)

S_{10} = 5q(2 -9+ 9z)

S_{10} = 5q(-7+ 9z)

S_{10} = 5q(9z -7)

4 0
3 years ago
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