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MrRa [10]
3 years ago
14

There are five boys and three girls in a swimming pool. If two people are selected at

Mathematics
1 answer:
Vlada [557]3 years ago
3 0

Answer:

its a 3/8 chance that there are girls

Step-by-step explanation:

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The hypotenuse of a right triangle is 13.0, and one leg is 9.0 units shorter than the other. Find the dimensions of the figure (
Darina [25.2K]
Let, one leg be x units. 
since the other leg is 9.0 units shorter than the other, 
the measure of the other leg =x-9 
hypotenuse =13.0 units 
According to Pythagorean theorem, the square of the hypotenuse is equal to the sum of squares of the other two sides.  
x^2 +(x-9)^2 =13^2 
x^2 + x^2 -18x +81 = 169 
2x^2-18x-88=0 
Divide the whole equation by 2 
x^2 - 9x -44 =0  
Let's use the quadratic formula to find the roots. 
formula: x= [-b ± sqrt(b^2-4*a*c)]/2*a  
a=1 b=-9 c=-44 
x= [9±sqrt(81+176)]/2
 =[9±sqrt(257)]/2
 =[9±16.03]/2
 =25.03/2 or -7.03/2
 length of a triangle cannot be negative,
 Therefore, x=25.03/2 =12.52 
 one leg =12.5 units
 other leg =12.52-9 =3.5 units
4 0
3 years ago
after riding the stationary bike for just 8 minutes, betty had burned 50 calories. how long must she ride if she wants to burn 3
Lyrx [107]

Answer:

52 minutes.

Step-by-step explanation:


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3 years ago
In a sample, which statement is TRUE about the age of the group surveyed? A) The age of the group surveyed should be lower than
AleksAgata [21]

Answer:

C

Step-by-step explanation:

8 0
3 years ago
Find the percent of the number. explain your method 120%of 75
cupoosta [38]
I would use is over of equals percent over 100 is woudl be 120% and of would be 75 then you would put x over 75
5 0
3 years ago
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Forty tickets are sold for a raffle with two prizes. You buy two tickets. What is the probability that you will win both prizes?
Trava [24]
Well, the first one is 2/40=1/20. The 2nd one is 1/39. You multiply these to get 1/780.
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