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3 years ago

Which equation has no solution? O |--31 = 5 12x - 1) = 0 O15-3x = -8 |- + 9 = 0

Mathematics

1 answer:

harkovskaia [24]3 years ago

4 0

A because it’s the first one I saw and it looks correct

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Find S^20 if the series 1 + 1.1 ..... is a (a) arithmetic (b) geometric

quester [9]

I'm guessing S^20 is actually referring to the 20th partial sum $S_{20}$ , with

$S_{20}=1+(1+1\times0.1)+(1+2\times0.1)+\cdots+(1+18\times0.1)+(1+19\times0.1)$

in the arithmetic case, and

$S_{20}=1+1.1+1.1^2+\cdots+1.1^{18}+1.1^{19}$

in the geometric case.

(a) Combining like terms, we have

$S_{20}=20+0.1(1+2+\cdots+18+19)$

and invoking the formula

$1+2+\cdots+(n-1)+n=\dfrac{n(n+1)}2$

we end up with

$S_{20}=20+0.1\dfrac{19\times20}2=39$

(b) Multiply $S_{20}$ by 1.1, then subtract this from $S_{20}$ :

$1.1S_{20}=1.1+1.1^2+1.1^3+\cdots+1.1^{19}+1.1^{20}$

$S_{20}-1.1S_{20}=-0.1S_{20}=1-1.1^{20}$
$\implies S_{20}=\dfrac{1.1^{20}-1}{0.1}\approx57.275$

7 0

2 years ago

The length of a football playing field is 100 yards between the opposing goal lines. What is the length of the football field in

sweet-ann [11.9K]

Answer:

33.3

Step-by-step explanation:

100 divided by 3

3 0

2 years ago

Math help plsssssssssss

goldenfox [79]

What do you need??????????????

4 0

2 years ago

What is the volume of the prism? _2 cm

Nana76 [90]

Answer:

66 cm^3

Step-by-step explanation:

based on the formula for a prism -

height * width * length

which would mean -

2 * 11 * 3

22 * 3

volume = 66 cm ^3

hope this helps!!

3 0

3 years ago

Read 2 more answers

I think its A or b but i dont know help!!!!!!!

murzikaleks [220]

Answer:

i think c is best I don no probably they gotta get a working to get the answer

5 0

2 years ago

Which equation has no solution? O |-*-31 = 5 12x - 1) = 0 O15-3x = -8 |-* + 9 = 0

Which equation has no solution? O |--31 = 5 12x - 1) = 0 O15-3x = -8 |- + 9 = 0