3 years ago

Does anyone know the answer to this?

Mathematics

2 answers:

Vlada [557]3 years ago

7 0

X=20
Hehehheheheheheheh

Ber [7]3 years ago

5 0

I think it is x=20 like he said

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3 0

3 years ago

Y varies directly with x. If y=3 when x=4, find y when x=20.

mina [271]

X=15

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8 0

3 years ago

If the variance of the water temperature in a lake is 30°, how many days should the researcher select to measure the temperature

Jet001 [13]

Answer: The number of days would be 7 days.

Step-by-step explanation:

Since we have given that

Variance = 30°

Standard deviation = √30 = 5.47

Mean = 4°

At 95% confidence, z = 1.96

So, number of days that the researcher select to measure the temperature would be

$n=(\dfrac{z\times \sigma}{error})^2\\\\n=(\dfrac{1.96\times 5.42}{4})^2\\\\n=7.053\\\\n=7$

Hence, the number of days would be 7 days.

3 0

4 years ago

a dice was to be rolled 10 times. the first 7 rolls were even. What is the probability of the 8th roll being odd numbered.

Basile [38]

The probability of the 8th roll being odd would still be 1/2 the first seven rolls won't change anything

3 0

3 years ago

DUE IN 2 MINTUES PLZZ HELP

zubka84 [21]

Answer:

1152000 ft or 218.18 miles

Step-by-step explanation:

6400 x 60 (60 minutes in an hour) = 384000 ft

384000 = one hour at top speed

384000 x 3 = 1152000 ft (3 hours at speed)

There is 5280 feet in a mile

1152000 / 5280 = 218.18 miles

brainliest if this was helpful

8 0

3 years ago