Answer:
890
Step-by-step explanation:
Well, first we should put 1.1 kg into grams (1 kg = 1000g)
1.1kg= 1100g
this is how much was added by the marbles
630/ # of marbles gives the mass of each marble

each marble has a mass of 105 g
1100- 2m(marble)=
1100-2*105
1100-210=
890
Answer: 91
Step-by-step explanation:
the equation to find the area of a trapezoid is as follows:
A = (a+b)/2h
So A = 6+20 which is 26
then you divide 26 by two which gives you 13, then multiply by 7
Answer: 
Step-by-step explanation:

Distribute the negative sign.

Remove the other parentheses.

Combine like terms.

The answer is B sorry i was wrong