75,000 into scientific notation is 7.5 × 10^4
0.04378818737
hope this helps<span>
</span>
All but √4/4 are irrational because the definition of an irrational number is a number that is never ending like pi, or a number that cannot be converted to a fraction. √1/4 is irrational because when you find the square root, it comes out with a number that is near impossible to convert to a fraction because it is a never ending decimal.
Answer:
10c3 =(10)!/(3!*7!) = (10*9*8)/(3*2*1) = 10*3*4 =120