Achieved points of students 6.a in the mathematics exam (total 50 points) are: For a grade sufficient it is necessary to have 45% of the total points, for a very good 80%, and for an excellent 90% of the total number of points. C) calculate the average grade of the class.​

0.36!!

Hope this helps!!

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.