Let me help you step bro ;)
The answer is 18. Just take the number that comes later and simply subtract from the original number. EXAMPLE- 138-120=18. Hope this helps.
There is 1000 grams in 1 kilogram. so. 100 grams if 10 bags = 1kilogram then 1 bag would be 1/10 of a kilogram. so 1/10 of 1000 = 100.
We are given this:
First step is to get rid of brackets. There is no sign in front of first brackets, so we do not change the sign. In front of second brackets there is negative sign so we need to change sign for each term inside of those brackets.
Next step is to group terms with same exponent in descending order.
Now we add or substract terms with same exponent.
Standard form means ordering terms in a descending order of an exponent.
(7x + 2 + 8x^4) – (2x – 5 – 8x^4) + (3x + 5x^4)
= 7x + 2 + 8x^4 – 2x + 5 + 8x^4 + 3x + 5x^4
= 8x + 7 + 21x^4
= 21x^4 + 8x + 7