There are 8 boys and 12 girls in a class.
What is the probability
that a girl is chosen to
do a math problem at
the board?

60% or 3/5

Step-by-step explanation:

12/20

12 girls + 8 boys = 20 total

12/20 / 2/2 = 6/10

6/10 = 60%

3/5 or 60%

Step-by-step explanation:

To find probability, we'll first find the total amount of students in the class. That's 8 boys + 12 girls, or 20 total students. Now, we have to find the probability that a girl will do a math problem at the board. There are 12 girls, so we have to divide 12 by 20 to find our probability.

12/20 is equal to 3/5, or 60%, depending on whether you want to put it in fraction or percentage form.

Hopefully this was helpful! If you need more help, let me know.

the correct option is 2.

step-by-step explanation:

according to the given information triangle abc is a right angle triangle with right angle at a. segment ab is 5 and segment ac is 7. point d is on segment bc and angles adb and adc are right angles.

it is given that triangles abd, cad, and cba are similar.

two triangles are similar if their corresponding sides are proportional.

in triangle cba, using pythagoras theorem

                      )

triangle abd and cba are similar,

                            (2)

triangle cad and cba are similar,

                      )

using (1), (2) and (3), we get

hence proved.

therefore option 2 is correct.

a28=58

step-by-step explanation:

a1=a1+(n-1)d

a28= 4+ (28-1)2

a28=4+(27)(2)

a28=4+54

a28=58