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2 years ago

Find the value of Z in the following equation 8Z =64

Mathematics

2 answers:

a_sh-v [17]2 years ago

7 0

8z = 64
divide both sides with 8

8z ÷8 = 64÷8
therefore,
z = 8.

wolverine [178]2 years ago

4 0

8z=64

you have to divide both sides by 8

8z/8 = 64/8

z=68/8

u will get z=8

so the answer is Z=8

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yKpoI14uk [10]

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2 years ago

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1 year ago

Find the sum of the first 6 terms of the sequence: –3, 1, 5, 9, . . .A) 45B) 42C) 48D) 25

Leni [432]

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From the sequence give

–3, 1, 5, 9, . . .

The first term, a = -3

The common difference, d = 4 (gotten by adding 4 to the next term).

The number of terms required n = 6.

Formula for sum of an arithmetic sequence is given by

$S_n=\frac{n}{2}\lbrack2a+(n-1)d\rbrack$

Substituting these values into the equation above we have

$\begin{gathered} S_n=\frac{n}{2}\lbrack2a+(n-1)d\rbrack \\ S_6=\frac{6}{2}\lbrack2\times-3+(6-1)4\rbrack \\ S_6=3\lbrack-6+(5)4\rbrack \\ S_6=3\lbrack-6+20\rbrack \\ S_6=3\lbrack14\rbrack \\ S_6=42 \end{gathered}$

Hence, the answer is 42, option B

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8 months ago