3 years ago

In a geometric sequence, a2 = 2, a3 = 20, & a4 = 200.

Mathematics

1 answer:

babymother [125]3 years ago

5 0

Answer:

the first one

the first one Step-by-step explanation:

the first one Step-by-step explanation:from the formula Un =ar^n-1

where a is 2

where a is 2 r = 20/2=10

where a is 2 r = 20/2=10 so Un= 10×2^n-1

that's all.....have fun

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From a rope 11m long two pieces of lengths 13/5m and 33/10m are cut off. What is the length the remaining rope?

Serhud [2]

Answer:

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Step-by-step explanation:

Given parameters:

Length of rope = 11m

First length cut off = $\frac{13}{5}$ m

Second length cut off = $\frac{33}{10}$ m

Unknown:

Remaining length = ?

Solution:

Let us find the total length cut off first;

= $\frac{13}{5}$ m + $\frac{33}{10}$ m

= $\frac{26 + 33}{10}$

= $\frac{59}{10}$ m

So,

Remaining length = 11 - $\frac{59}{10}$

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