3 years ago

5X +20 and the opposite of 20

Mathematics

1 answer:

kotykmax [81]3 years ago

5 0

Answer: 5x+(-20)=-15x Step-by-step explanation:

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Renee recently traveled with her family in their mini van. She sat in the backseat for the first half of the trip. Then she rode

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Answer:

1.75 hours

Step-by-step explanation:

7÷4=1.75

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3 years ago

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On election day, numerous voters line up at a local station. A researcher polls every tenth person in the line. The type of samp

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systematic

this method called "systematic random sampling"

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3 years ago

How many different three-digit numbers can be written using digits from the set 5, 6, 7, 8, 9 without any repeating digits?

suter [353]

Answer: 60 different numbers can be formed

Step-by-step explanation:

Note that we have 5 different digits, and we must select 3 of them. They should not be repeated

The order of selection is important in this case, because the number 532 is not the same as the number 235.

So we have a permutations problem, where we have a set of n elements and we want to choose r from them.

Then we define the permutacion as:

$nPr=\frac{n!}{(n-r)!}$

In this case note that n=5 because there are 5 elements in the set.

r = 3 because we combine the elements to form three-digit numbers

Then:

$5P2=\frac{5!}{(5-3)!}$

$5P2=\frac{5!}{2!}$

$5P2=\frac{5*4*3*2!}{2!}$

$5P2=5*4*3$

$5P2=60$

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3 years ago

In an 18-meter race between a tortoise and a hare, the tortoise leaves 23 minutes before the hare. The hare, by running at an av

seropon [69]

We know that:
time=distance/speed
if the tortoise speed is x m/min, then since 0.5 m/hr=1/120 m/min
18/x=23+18/(x+1/120)
solving for x we get:
x=0.08 m/min
speed of hare is:
(0.08+1/120)=0.088 m/min

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3 years ago

Be sure to round to 4 sig fig for your answer.

Tresset [83]

Answer:

1) 1.203

2) 1.291

Step-by-step explanation:

1 mL = 0.001 L

1202.57120 mL = 1.20257120 L

round to 4 sig fig = 1.203

1g = 10dg

0.1290743 g = 1.290743 dg

round to 4 sig fig = 1.291

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3 years ago