Well 4 copies of one tenth will equal 4 tenths. so when u simplify 4 over ten (4/10 )and divide the top and bottom by the common factor which is 2 then you will get 2 fifths because 4 divided by 2 is 2 and 10 divided by 2 is 5.
The answer is c to the question
First you must reduce -4(2x-1) which is -8+4>5-3
2.3×1.5×10²=3.45×100=345.