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4 years ago

do you think that a negative sign affects whether or not a number is rational number? Use -8/5 an example.

1 answer:

lina2011 [118]4 years ago

5 0

-8/5 is a rational number because in order to be a rational number it must be able to be written as a fraction. -8/5 is a fraction; therefore, the negative does not affect it.

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Please help!!! Will give Brainliest!!! A standard large pizza is cut into 10 slices. What is the sector area of one slice of lar

Aleks [24]

Answer:

See work below

Step-by-step explanation:

The area of a large pizza cut into 10 slices with be 20 square inches. This is from taking the area of a large 200.96 and dividing by 10.

The large pizza will always be cheaper because of economies of scale.

5 0

4 years ago

Find the sum of all multiples of 4 between 25 and 100

Mademuasel [1]

Answer:

Sum of all multiples of 4 between 25 and 100 is 1116.

Step-by-step explanation:

Multiples of 4 between 25 and 100 = 28,32,36,40..............,96

let's check the series whether it is an arithmetic progression

a1 = 28 , a2 = 32 , a3 = 36 , a4 = 40

Common difference (d)=a2-a1=32-28 = 4

=a3-a2=36-32 = 4

=a4-a3=40-36 = 4

Common difference exists then the series of numbers is an Arithmetic progression.

To find number of terms :

a(a1) = 28 , d = 4 , l( last term ) = 96

l = a + (n-1)d

96 = 28 + (n-1)4

96 - 28 = (n-1)4

68 = (n-1)4

68/4 = (n-1)

17 = n - 1

17 + 1 = n

18 = n

Sum of all terms:

a = 28 , d = 4 , n = 18 , l = 96

Sn = n/2 ( a + l )

S18 = 18 / 2 (28 + 96)

S18 = 9 (124)

S18 = 1116

Therefore,Sum of all multiples of 4 between 25 and 100 is 1116.

NOTE:

Here 100 is also a multiple of 4 but question is asked between 25 and 100 so 100 is not considered in multiples.

7 0

3 years ago

A flower shop charges $3 for a vase and $2 for each rose. Which equation can be used to determine the cost in dollars,y, if Jan

s344n2d4d5 [400]

Answer:

y=3+2x

Step-by-step explanation:

8 0

3 years ago

An element with mass 210 grams decays by 8.3% per minute. How much of the element is remaining after 15 minutes, to the nearest

GarryVolchara [31]

Answer:

$57.2\ g$

Step-by-step explanation:

In this problem we have a exponential function of the form

$f(x)=a(b^x)$

where

f(x) is the remaining mass of the element in grams

x is the time in minutes

a is the initial value (y-intercept of the exponential function)

b is the base

r is the rate

$b=(1+r)$

In this problem we have

$a=210\ g$

$r=-8.3\%=-8.3/100=-0.083$ ---> is negative because is a decay's rate

$b=(1-0.083)=0.917$

substitute

The exponential function is equal to

$f(x)=210(0.917^x)$

For x=15 minutes

substitute in the function

$f(x)=210(0.917^15)$

$f(x)=57.2\ g$

4 0

3 years ago

Estimate the difference between the decimals 9.25 and 6.5 by rounding to the nearest whole number before subtracting.

Nat2105 [25]

Answer:

Step-by-step explanation:

8 0

3 years ago

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