I need hello with the following Math Problem.
Jamir had a lot of Lego blocks. The pieces in his bin have either 6 knobs on the top, or 4 knobs. One day Jamie gets bored and counts all of the knobs on the tops of all of the pieces, and comes up with 280 knobs! He also knows that his bin contains 55 total Lego pieces, but he can't remember how many of each type he has. Help Jamir figure out the number pieces with 6 knobs, and the number of pieces with 4 knobs in his bin.

Step-by-step explanation:

Okay, so if you do...

30x6=180

25x4=100

180+100=280

30+25=55

So your answer would be it takes 30 6-knobs legos and 25 4-knobs legos to make 280.

it has to have an angle of 90 degrees

answer: a

step-by-step explanation: the answer is a due to the rule of symmetry; that a line of symmetry must divide a figure into 2 pieces that are the exact same, only reflected over a line of symmetry. b and c do not have lines of symmetry and would not divide the figure evenly, thus making the answer a.