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3 years ago

I'm a factor of 20 but not a multiple of 5

2 answers:

8 0

Factor of 20: 1, 2, 4, 5, 10, 20
Multiple of 5: 5, 10, 15, 20, 25, ...

1, 2, and 4 are factors of 20 but are not multiples of 5.

lianna [129]3 years ago

4 0

2 is a factor of 20 and not a multiple of 5

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The length of a solar car race track is supposed to be 4.8 meters.

snow_tiger [21]

Answer:

-12.5%

Step-by-step explanation:

A percentage change is computed using ...

percent change = ((new amount) -(original amount))/(original amount) × 100%

We want to find the percentage change from 4.8 m, so we have ...

percent change = (4.2 -4.8)/4.8 × 100% = -.6/4.8×100% = -12.5%

The carpenter made the track 12.5% too short.

7 0

3 years ago

A civil engineer is analyzing the compressive strength of concrete. Compressive strength is normally distributed with A random s

wel

Answer:

95%: (3278.354 ; 3270.083)

99% : (3221.646 ; 3278.354)

Step-by-step explanation:

Given :

Sample size, n = 12

Mean, xbar = 3250

Sample standard deviation = √1000

The 95% confidence interval :

Mean ± Margin of error

Margin of Error = Tcritical * s/√n

Tcritical at 0.05, df=12-1 = 11 ;

Tcritical at 95% = 2.20

Hence,

Margin of Error = (2.20 * √1000/√12) = 20.083

Confidence interval : 3250 ± 20.083

Lower boundary = 3250 - 20.083 = 3229.917

Upper boundary = 3250 + 20.083 = 3270.083

2.)

The 99% confidence interval :

Mean ± Margin of error

Margin of Error = Tcritical * s/√n

Tcritical at 0.01, df=12-1 = 11 ;

Tcritical at 99% = 3.106

Hence,

Margin of Error = (3.106 * √1000/√12) = 28.354

Confidence interval : 3250 ± 28.354

Lower boundary = 3250 - 28.354 = 3221.646

Upper boundary = 3250 + 28.354 = 3278.354

3 0

3 years ago

Use exponents to write the numbers 81 and 64 in as many different ways as you can. Then write 64/81 using exponents in as many d

Vlad1618 [11]

Answer:

Step-by-step explanation:

edge 2021

3 0

3 years ago

One card is selected at random from a deck of card. Determine the probability that the card selected is not a 4

Ganezh [65]

Answer:

12/13

Step-by-step explanation:

A probability is the number of desired outcomes over the total number of outcomes.

Assuming that this is a standard deck of playing cards, there will be 52 cards, and there will be 4 "4" cards.

First, find the number of desired outcomes, and put it over the total number of outcomes.

Out of the total number of outcomes (52), there are 4 outcomes that are not wanted, hence the equation is:

52 - 4 = 48

So out of the 52 possible outcomes, 48 are desired. Set up the fraction and

simplify:

48/52

/4 /4

= 12/13

7 0

3 years ago

Write 2.31*10-^3 using scientific notation

Ludmilka [50]

<span>2.31*10-^3 using scientific notation
= 0.00231</span>

6 0

3 years ago