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2 years ago

Jill paid $4 for a sandwich. She now has $25. With how much did money did she start

Mathematics

2 answers:

Alexxandr [17]2 years ago

8 0

Answer:

Step-by-step explanation:

25+4

you take the final amount and add what was taken to find the initial value

Cloud [144]2 years ago

4 0

She first started with 29$

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A collection of 30 gems, all of which are identical in appearance, are supposedto be genuine diamonds, but actually contain 8 wo

levacccp [35]

Answer:

Step-by-step explanation:

From the given information:

There are 30 collections of gems, of which 8 are worthless;

Thus, the number of the genuine diamonds = 30 - 8 = 22.

Let X = random variable;

X consider the value as 0 (for 2 worthless stone selection),

X = 1200(1 worthless stone & 1 genuine stone)

X = 2400 (2 genuine stones selected)

However, the numbers of ways of selecting and chosen Gems can be estimated as:

$(^n_r) = (^{30}_2) \\ \\ \implies \dfrac{30!}{2!(30-2)!} \\ \\ \implies \dfrac{30!}{2!(28)!} \\ \\ \implies \dfrac{30*29*28!}{2!(28)!} \\ \\ \implies \dfrac{30*29}{2*1} \\ \\ \implies 435$

Thus;

$Pr (X = 0) = \dfrac{(^8_2)}{435}$

$Pr (X = 0) = \dfrac{\dfrac{8!}{2!(8-2)!}}{435} \\ \\ Pr (X = 0) = \dfrac{\dfrac{8!}{2!(6)!}}{435} \\ \\ Pr (X = 0) = \dfrac{\dfrac{8*7*6!}{2!(6)!}}{435} \\ \\ Pr (X = 0) = \dfrac{\dfrac{8*7}{2*1}}{435} \\ \\ Pr (X = 0) = 0.0644$

$P(X =1200) = \dfrac{(^{8}_{1})(^{22}_{1})}{435}$

$P(X =1200) = \dfrac{ \dfrac{8!}{1!(8-1)!}) ( \dfrac{22!}{1!(22-1)!}) }{435}$

$P(X =1200) = \dfrac{ (8) ( 22) }{435}$

$P(X =1200) =0.4046$

$Pr (X = 2400) = \dfrac{(^{22}_2)}{435}$

$Pr (X = 2400) = \dfrac{\dfrac{22!}{2!(22-2)!}}{435} \\ \\ Pr (X = 2400) = \dfrac{\dfrac{22!}{2!(20)!}}{435} \\ \\ Pr (X = 2400) = \dfrac{\dfrac{22*21*20!}{2!(20)!}}{435} \\ \\ Pr (X =2400) = \dfrac{\dfrac{22*21}{2*1}}{435} \\ \\ Pr (X = 2400) = 0.5310$

To find E(X):

E(X) = (0 × 0.0644) + (1200 × 0.4046) + (2400 × 0.5310)

E(X) = 0 + 485.52 + 1274.4

E(X) = 1759.92

8 0

2 years ago

In the diagram, FG=34, GH=288, and HJ=256. Is GH tangent to circle F?

Anastaziya [24]

Answer:

Step-by-step explanation:

If GH is tangent to circle F, then it forms a right angle with FG. Therefore, triangle FGH would be a right triangle and would satisfy Pythagorean theorem.

34² + 256² = 288²

66692 = 82944

The sides are not a Pythagorean triple, so GH is not tangent to the circle.

6 0

2 years ago

Jill makes 40 hours per week. She makes $20 per hour. What is his gross pay

krek1111 [17]

Answer:

Weekly Gross Income: $800

Anual Gross Income: $41,600

Monthly Gross Income: $3,466.67

Step-by-step explanation:

Weekly: 40 x 20 = 800

Anual: 40 x 20= 800 800x52= 41,600

Monthly:41,600 / 12= 3,466.6666666666666666666666

4 0

2 years ago

I need help with this

Angelina_Jolie [31]

Answer: 256

F(8)=512- 768
F(8)= 256
Hopes this helps

3 0

1 year ago

A tower is composed of a prism with a square base and

gregori [183]

Answer:

a)400V2 plus 3,600 m2

Step-by-step explanation:

3 0

2 years ago

Read 2 more answers