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kodGreya [7K]
3 years ago
12

The recommended time to take a math test is 23 minutes. you complete it in 18 minutes. what is the percent change between your t

ime and the recommended time?
Mathematics
2 answers:
LenKa [72]3 years ago
8 0
I did my math and I think 41 minuets but are u adding or subracting
abruzzese [7]3 years ago
7 0
This is a percentage decrease, since the number gets smaller. To calculate percentage decrease, you use the formula ((y1 - y2) / y1) * 100. y1 = 23, y2 = 18. Plug in the values and solve. ((23 - 18)/23) * 100. (5/23) * 100. (0.2174) * 100 21.74 So your answer is 21.74%
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Mohamed and Li Jing were asked to find an explicit formula for the sequence -5, -25, -125, -625,....
Nuetrik [128]

Answer:

Li Jing's formula i.e.  \boxed{g_n=-5\cdot \:5^{n-1}}  is right.

Step-by-step explanation:

Considering the sequence

-5,\:-25,\:-125,\:-625,...

A geometric sequence has a constant ratio r and is defined by

g_n=g_0\cdot r^{n-1}

\mathrm{Compute\:the\:ratios\:of\:all\:the\:adjacent\:terms}:\quad \:r=\frac{g_{n+1}}{g_n}

\frac{-25}{-5}=5,\:\quad \frac{-125}{-25}=5,\:\quad \frac{-625}{-125}=5

\mathrm{The\:ratio\:of\:all\:the\:adjacent\:terms\:is\:the\:same\:and\:equal\:to}

r=5

So, the sequence is geometric.

as

\mathrm{The\:first\:element\:of\:the\:sequence\:is}

g_1=-5

r=5

so

g_n=g_1\cdot r^{n-1}

\mathrm{Therefore,\:the\:}n\mathrm{th\:term\:is\:computed\:by}\:

g_n=-5\cdot \:5^{n-1}

Therefore, Li Jing's formula i.e.  \boxed{g_n=-5\cdot \:5^{n-1}}  is right.

8 0
3 years ago
Will give brainliest.
Lady bird [3.3K]

Answer:

x=8

Step-by-step explanation:

Those angles are supplementary so:

140+5x=180

5x=40

x=8

4 0
3 years ago
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What is value of the 8 in 325,785,901
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if you're speaking of place value?
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Solve using the Quadratic Formula.
sveticcg [70]
A) x=5+/-73 is the answer I think
4 0
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