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Sergeu [11.5K]
1 year ago
15

The probability that a student chosen at random from a class has blonde

Mathematics
1 answer:
11111nata11111 [884]1 year ago
3 0

Answer:

Step-by-step explanation i dont know

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Use the identity x3+y3+z3−3xyz=(x+y+z)(x2+y2+z2−xy−yz−zx) to determine the value of the sum of three integers given: the sum of
fenix001 [56]

ffn

x^3+y^3+z^3-3xyz=(x+y+z)(x^2+y^2+z^2-xy-yz-zx)

x^3+y^3+z^3-3xyz=(x+y+z)(x^2+y^2+z^2-(xy+yz+zx))

the sum of their squares is 110, So x^2+y^2 + z^2= 110

the sum of their cubes is 684, so  x^3+y^3 + z^3= 684

the product of the three integers is 210, so xyz= 210

the sum of any two products (xy+yz+zx) is 107

Now we plug in all the values in the identity

x^3+y^3+z^3-3xyz=(x+y+z)(x^2+y^2+z^2-(xy+yz+zx))

684 - 3(210) = (x+y+z)(110-107)

684 - 630 = (x+y+z)(3)

54 = 3(x+y+z)

Divide by 3 on both sides

18 = x+y+z

the value of the sum of three integers is 18

3 0
4 years ago
Which number goes in the box to make this a true number sentence? 7 × (3 + 9) = 21 +
Bumek [7]
7(3 + 9) = 7(3) + 7(9) = 21 + 63
4 0
3 years ago
Read 2 more answers
There are 2 girls and 3 boys on a camping trip. What is the ratio of girls<br> to boys on the trip?
vodka [1.7K]

Answer:

2/3

Step-by-step explanation:

6 0
3 years ago
An ice cream vendor sells three flavors: chocolate, strawberry, and vanilla. Forty five percent of the sales are chocolate, whil
olganol [36]

Answer:


Step-by-step explanation:

Sales of the chocolate ice cream is 45%, 30% for strawberry and 25% (100%-45%-30%) of vanilla.

Percentages of cone sales for chocolate, strawberry and vanilla are 75%, 60% and 40%respectively.

A. Probability chocolate chosen: 45%=0.45

B. Probability strawberry chosen: 30%=0.30

C. Probability vanilla chosen:25%=0.25

D. Probability ice cream on a cone: 75%×45%+60%×30%+40%×25%

                                                          =0.75×0.45+0.60×0.30+0.40×0.25

                                                          =0.3375+0.18+0.1

                                                          =0.6175

E. Probability ice cream in a cup: 1- Probability ice cream in a cone

                                                     =1-0.6175

                                                     =0.3825

Probability that the ice cream sold on a cone and was strawberry flavoured is : 30%×60%

=0.30×0.60

=0.18

3 0
3 years ago
Read 2 more answers
Help plz do those blank ones plz it would mean alot of help
Korvikt [17]
The second in the top row is this:
42.4-1.5(TIMES)3.1
     42.4-46.5
           -4.1

6 0
3 years ago
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