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4 years ago

24 red marbles is40% of ? Marbles

Mathematics

2 answers:

SIZIF [17.4K]4 years ago

6 0

The answer is 24 marbles is 40 percent of 60.

Anvisha [2.4K]4 years ago

5 0

Answer: The answer is 60

Step-by-step explanation: 40% = .4 because % means hundredths. So 40% = 40/100 = .4

Let x be the total number of marbles.

Then, .4x = 24

Divide both sides by .4

x = 60 and 24 is 40% of 60 marbles

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the area A of a rectangle parking lot is given by the equation A=16s^2+25. jacob knows the area of the parking lot and wants to

patriot [66]

Answer:

s = sqrt(A - 25)/4

Step-by-step explanation:

A = 16s^2 + 25

Switch sides.

16s^2 + 25 = A

Subtract 25 from both sides.

16s^2 = A - 25

Divide both sides by 16

s^2 = (A - 25)/16

Take the square root of each side.

s = sqrt[(A - 25)/16]

s = sqrt(A - 25)/4

3 0

3 years ago

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The force acting on a beam was measured 5 times under the same operating conditions. This process was repeated by 3 observers, r

Akimi4 [234]

Answer:

The Pooled Standard Deviation for these data sets is 1.09

Step-by-step explanation:

Given that;

Standard Deviation 1 = 1.11

Standard Deviation 2 = 0.99

Standard Deviation 3 = 1.15

pooled standard deviation is given as;

$S_{pooled}$ = (n1 - 1 )s1² + ..... + ( nk - 1 )sk² / n1 + ..... + nk - 1

where n1, n2....., nk are the sample sizes of k groups and s1, s2, ....., sk are the standard deviations of k groups respectively

so for the 3 groups;

$S_{pooled}$ ² = (n1 - 1 )s1² + (n2 - 1 )s2² + ( n3 - 1)s3² / n1 + n2 + n3 - 3

we substitute

$S_{pooled}$ ² = (5 - 1 )1.11² + (5 - 1 )0.99 ² + ( 5 - 1)1.15² / 5 + 5 + 5 - 3

$S_{pooled}$ ² = (4.9284 + 3.9204 + 5.29) / 12

$S_{pooled}$ ² = 14.1388 / 12

$S_{pooled}$ ² = 1.1782

$S_{pooled}$ = √1.1782

$S_{pooled}$ = 1.08544 ≈ 1.09

Therefore, The Pooled Standard Deviation for these data sets is 1.09

6 0

3 years ago

2/3 is less than 2/6

Alexandra [31]

False, 2/6 is less than 2/3

6 0

3 years ago

Read 2 more answers

Solve the problems using systems of equations.

maw [93]

Step-by-step explanation:

Let the two numbers be x and y

x+y =5 ---1

x-y =-3 ---2

Rearrange equation 1

x =5-y

Substitute x in the second equation

(5-y)-y =-3

5-y-y =-3

5-2y =-3

Collect like terms

5+3 = 2y

8 = 2y

Divide both sides by the coefficient of y (2)

8/2 = 2y/2

4 = y

y= 4

Substitute y in equation 1

x+4 =5

Subtract 4 from both sides

x+4-4 = 5-4

x+0 = 1

x= 1

The two numbers are 1 and 4

5 0

2 years ago

there are 60 new houses being built in a neighborhood. Last month, 2/3 of them were sold. This month, 2/5 of the remaining house

SIZIF [17.4K]

Sold Last Month: 60 x $\frac{2}{3}$ = 40

Remaining from last month: 60 - 40 = 20

Sold This Month: 20 x $\frac{2}{5}$ = 8

Remaining from this month: 20 - 8 = 12

Answer: there are 12 houses left to be sold

6 0

3 years ago