There are 11pens in a box.8 are to black and 3 are red. two pens are taken out. work outthe probability that two are the same color.

If both pens are the same color, it means that they are either black and black or red and red.If without replacement,pr. of first black and second black is

8/11 and 7/10.Also, the pr of the first red and sencond red pen= 3/11 and 2/10.

Therefore pr. of bb or rr

(8/11×7/10)+(3/11×2/10)

56/110+6/110 =31/50

c.   x=2.4cm

step-by-step explanation:

similar triangles are triangles which have the same shape but not the same size. this means their angle measures are equal but their side lengths are not instead they are proportional. to solve, we will set up a proportion and solve.

a proportion is two equal ratios set equal to each other. we form the ratios by finding corresponding sides (sides which match to each other on both triangles by their position). out ratios will be one side of the small triangle over the corresponding side on the big triangle as shown below:

.

to solve the proportion, we'll cross multiply by multiplying numerator with denominator across the equal sign.

step-by-step explanation: