3 years ago

If four students are selected at random, find the probability that all four rate their study habits as very good

Mathematics

1 answer:

maxonik [38]3 years ago

8 0

Would depend on how many other students are in the class/school.

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misty bought 3 cd's.the country music cd cost $12.the roc cd cost 2/3 as much as the country music.the platinum edition cd cost

Mandarinka [93]

Country music cd- $12
Rock music cd- 12× 2/3 = $8
Platinum edition cd- $8 x 2 = $16

16+12+8 = $36

Hope this helps :3

5 0

3 years ago

Algebraic expression and identity 1)simplify the following (3a+b)3 +(3a-b)3

mylen [45]

Answer:

$(3a+b)^3+(3a-b)^3=54a^3+18ab^2$

Step-by-step explanation:

Given: $(3a+b)^3+(3a-b)^3$

Formula: $x^3+y^3=(x+y)(x^2-xy+y^2)$

$(x+y)^2=x^2+2xy+y^2$

$(x-y)^2=x^2-2xy+y^2$

$x\rightarrow 3a+b$

$y\rightarrow 3a-b$

$\Rightarrow (3a+b+3a-b)((3a+b)^2-(3a+b)(3a-b)+(3a-b)^2)$

$\Rightarrow (6a)(9a^2+b^2+6ab-9a^2+b^2+9a^2+b^2-6ab)$

$\Rightarrow (6a)(9a^2+3b^2)$

$\Rightarrow 54a^3+18ab^2$

5 0

3 years ago

Solve this equation for f.<br> 11.75 + f = 6.38

Eddi Din [679]

the answer to the question is F= -5.37

4 0

3 years ago

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Find all real solutions of the equation by completing the square. (Enter your answers as a comma-separated list.) x2 − 4x − 8 =

Nat2105 [25]

Answer:

After completing the square the expression is (x-2)^2 -12 =0 and real solution are x = 5.46 and x = -1.46

Step-by-step explanation:

We need to complete the square:

x^2 − 4x − 8 = 0

x^2 -2(x)(2)+(2)^2 -8 -4 =0

(x^2 -4x +4) - 12 = 0

(x-2)^2 -12 =0

Now, finding the value of x

(x-2)^2 -12 =0

(x-2)^2 = 12

taking square root on both sides

$\sqrt{(x-2)^2}= \sqrt{12} \\(x-2) = \pm\sqrt{12} \\x = \pm\sqrt{12} +2\\x = \sqrt{12}+2 \,\,and\,\,x=-\sqrt{12}+2\\x= 3.46+2 \,\,and\,\,x=-3.46+2\\x =5.46\,\,and\,\,x=-1.46$

So, After completing the square the expression is (x-2)^2 -12 =0 and real solution are x = 5.46 and x = -1.46

5 0

3 years ago

1/6 of 3 yards= --------feet is it 1 1/2 or 1/2 or 3 or 1/18

erica [24]

1/2 yards times ) is 3, so 1/2 would be the answer.

8 0

3 years ago

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