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2 years ago

How many different outcomes are there if a cube with 4 red faces and 2 white faces is rolled once

Mathematics

1 answer:

Karolina [17]2 years ago

3 0

It is 3 how many different outcomes are they there are three outcomes road once

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Twin brothers, Billy and Bobby, can mow their grandparent’s lawn together in 63 minutes. Billy could mow the lawn by himself in

Pepsi [2]

Answer:

<h2>140 minutes</h2>

Step-by-step explanation:

this problem focuses on the combined work rate

both can finish the work under 63 minute

let bobby mow the lawn in x minute

Billy will then mow the lawn in x-25 minutes

Let the completed job = 1 (a mowed lawn)

we can now apply the combined work formula for the two boys as

$\frac{63}{x}+\frac{63}{x-25}=1$

multiplying through by x(x-25 )we have

$63(x-25)+63x= x(x-25)$

open bracket we have

$63x-1575+63x= x^2-25x$

rearranging and collecting like terms we have

$0=x^2-25x-63x-63x+1575 \\\\0=x^2-151x+1575 \\\\x^2-151x+1575=0$

we can now use the quadractic formula

$x=\frac{-b\frac{+}{} \sqrt{b^2-4ac} }{2a}$

a= 1

b= -151

c= 1575

$x=\frac{-(-151)\frac{+}{} \sqrt{151^2-4*1*1575} }{2*1}$

$x=\frac{-(-151)\frac{+}{} \sqrt{22801-6300} }{2} \\\\x=\frac{-(-151)\frac{+}{} \sqrt{16501} }{2} \\\\x=\frac{-(-151)\frac{+}{} 128.45}{2} \\\\$

$x=\frac{-(-151)+128.45}{2} \\\\\x=\frac{279.45}{2} \\\\x=139.72 \\\\\\x=\frac{-(-151)-128.45}{2}\\\\x=\frac{151-128.45}{2}\\\\x=\frac{22.55}{2}\\\\x=11.27$

the first answer x= 139.72 approximately 140 minutes mins is correct for Bobby's time

let us check

$\frac{63}{140}+\frac{63}{140-25}=1\\\\\\0.45+\frac{63}{115} =1\\\\0.45+0.5478=1\\0.997 =1$

we can see that the solution approximates to 1

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3 years ago

Krishna has $4.90 with a combined 34 nickels and quarters. How many of<br> each coin does she have?

Oksana_A [137]

Answer:

Step-by-step explanation:

-34 nickles is = 1.70

34 quarter is = 8.50

1.70 plus 8.50 plus 4.90 = 15.1 i think

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2 years ago

Given line segment AB with endpoints A(-1,7) and B(11, -1)<br> Find the length of AB.

ser-zykov [4K]

Step-by-step explanation:

some to check if it correct

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2 years ago

If mr.s rivas has 256 donust and she needs to give the same amount of dounts to her 5 freinds

Leona [35]

Answer:

256/5=51.2

Step-by-step explanation:

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2 years ago

Read 2 more answers

What is 91/200 in simplest form?

fgiga [73]

That is the simplest fraction form. :)

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2 years ago

How many different outcomes are there if a cube with 4 red faces and 2 white faces is rolled once​

How many different outcomes are there if a cube with 4 red faces and 2 white faces is rolled once