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Volgvan
3 years ago
5

How many 4 digit palindromes contain both the digits 1 and 2

Mathematics
1 answer:
Norma-Jean [14]3 years ago
8 0

What a clever sneaky little problem !

There can only be two of them:    1221  and  2112 .

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Chocolate chip and peanut butter cookies are randomly chosen from a cookie jar and placed onto a plate. The first plate had four
soldier1979 [14.2K]

Answer:

3 peanut cookies

Step-by-step explanation:

Given that :

Plate 1:

Number of chocolate chip = 4

Number of peanut butter cookies = 1

Probability of drawing chocolate chip cookies from plate 1 :

Probability =( number of required outcome / Total possible outcomes)

P(chocolate chip) = 4 / 5

Plate 2:

Number of chocolate chip = 2

Number of peanut butter cookies = p

P(chocolate chip) = 2 / (2 + p)

Probability of drawing chocolate chip from plate 1 and then plate 2 = 8/ 25

(4/5) * 2/(2+p) = 8/ 25

8 / (10 + 5p) = 8/ 25

8(10 + 5p) = 8 * 25

80 + 40p = 200

40p = 200 - 80

40p = 120

p = 3

7 0
2 years ago
Common denominators of 9 45 27 3
Sauron [17]
The answer is they all have a factor of 9
7 0
3 years ago
Read 2 more answers
The circumference of a circle is 19π in. What is the area, in square inches? Express your answer in terms of π.
Lelu [443]

Answer:

A = 90.25 pi in^2

Step-by-step explanation:

The circumference is given by

C = 2*pi*r

19pi = 2*pi*r

Divide each side by 2 pi

19pi / 2 pi = 2*pi*r/ 2pi

9.5 = r

The area is given by

A = pi r^2

A = pi ( 9.5)^2

A = 90.25 pi in^2

8 0
3 years ago
Read 2 more answers
If m=36 cm and n=37cm, what is the length of n?
Nady [450]
N = 37 cm because it already said it in the question.
5 0
3 years ago
Y=-2x+2<br> y = 7x +11<br> Solve systems by substitution
Agata [3.3K]

Answer: (-1,4)

Step-by-step explanation:

y=-2x+2                                    y=7x+11 <----- substitute this equation for y in the            

                                                                       equation y=-2x+2

7x+11=-2x+2              Add 2x to both sides

9x+11=2                     Subtract 11 from both sides

9x=-9                         Divide both sides by 9

x=-1

y=-2(-1)+2                   Plug in x to one of the equations, I chose y=-2x+2            

y=2+2                         because it was the easiest, then solve

y=4

Solution is (-1,4)

5 0
3 years ago
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