A science class has 3 girls and 7 boys in the seventh grade and 5 girls and 5 boys in eighth grade the teacher randomly selected a seventh grader and an eighth grader from the class for a competition what is the probability that the students she selected are both boys?

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Step-by-step explanation:

i'm not sure but try look for you tube videos on how to work it out.

step-by-step explanation: given equation a = h(b 1+b 2)

also we are given values of a, h and b 1 as :

a = 16, h = 4, and b 1 = 3.

in order to solve it for b 2, we need to plug the given values of   a, h and b 1 .

therefore, plugging values of   a, h and b 1   in given equation, we get

16 = 4( 3 + b 2)

first dividing both sides by 4, we get

4 = 3 + b 2

subtracting 3 from both sides, we get

4 -3 = 3 -3 + b 2

1 = b 2.

answer is (b.

164 ft2)

a base  

18

b base  

7

h height  

8