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PIT_PIT [208]
3 years ago
9

A red marble is selected at random from a bag containing 2 blues and 9 red marbles and is not replaced.the probability that a se

cond marble selected will also be red is
Mathematics
2 answers:
meriva3 years ago
3 0

Answer:

 So the probability of drawing a second red marble is 8 out 10 or 0.8.

Step-by-step explanation:

It seems to me that if one red marble is already gone, there are 8 red marbles left out of a total of 10 marbles.

So the probability of drawing a second red marble is 8 out 10 or 0.8.

liraira [26]3 years ago
3 0

Answer:

8/10 or 4/5 or 0.8

Step-by-step explanation:

since one red marble is already taken, there are only eight remaining now and the total number of marbles are ten now. So you have to divide.

Therefore, the probability is 8/10 or 4/5 or 0.8.

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65% of the 800 students at North High School ride the
jonny [76]

Answer:

520 out of 800 students ride the bus

Step-by-step explanation:

Given

Proportion = 65\%

Students = 800

Required

Determine the number of students that\ ride\ the\ bus

To do this, we simply multiply the proportion by the total number of students.

i.e.

Bus = Proportion * Students

Bus = 65\% * 800

Express the percentage as decimal

Bus = 0.65* 800

Bus = 520

<em />

6 0
3 years ago
The height of the tunnel at the center is 54 ft, and the vertical clearance must be 18 ft at a point 8 ft from the center. Find
IrinaVladis [17]

the standard form for a horizontal ellipse is

X^2/a^2 + y^2/b^2 = 1

Substitute 54 for b and and use (8,18) as the

point to find a

x=8

y=18

8^2/a^2 + 18^2/54^2 =1

64/a^2 +  324/2916 = 1

324/2916 reduces to 1/9

64/a^2 + 1/9 = 1

64/a^2= 1-1/9

64/a^2 = 8/9

64*9/8 = a^2

576/8 = 72

A^2 = 72

A = square root(72) = 8.485

 So formula

would be x^2/72 + y^2/2916 =1

8 0
3 years ago
Emily made $12.50 selling lemonade for 2 hours. If Emily wants to save $100, approximately how many hours would she need to sell
Ne4ueva [31]

Answer:

she needs to work 16 hours

8 0
3 years ago
Please I need help, JUST one problem.<br> I need to show my work please!!
lara31 [8.8K]

Answer:

proved that x=9

Step-by-step explanation:

A line that splits an angle into two equal angles. ("Bisect" means to divide into two equal parts)

so <CAB=<DAB

7x+2=5(x+4)

7x+2=5x+20

7x-5x=20-2

2x=18

x=9

7 0
3 years ago
Michelle ordered 200 T-shirts to sell at the school carnival. She paid $2.80 per shirt, plus 5% of the total order for shipping.
djyliett [7]

Answer: She should sell each T-Shirt for at least $4.41

Step-by-step explanation:

First you need to figure out what the total cost of the 200 t shirts was plus shipping. so 200 t shirts for 2.8 would cost $560 + a 5% shipping fee ($28) = 588 if she wants to markup by 150. you would then multiply 588 * 1.5 = $882. This would be the final money she wants to make by the end of her school carnival. Divide 882/200 (amnt of t-shirts) to get $4.41 per shirt

4 0
3 years ago
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