What percentage of students have no brothers OR sisters but have a dog?

80+60=130 so 130/1000 you may need to divide

13%

Step-by-step explanation:

130/1000 is simplified down to 13/100 : ) hope i helped

To factorise you have to find what multiplies to the number without an x and adds to the number with x
What times to 16 and add to 10?
8 and 2
Put these in brackets with x
(x+8)(x+2)=0
To find what x is you need to make both bracket equal zero
The easy way to do this is to flip the sign
x=-8
x=-2
The solutions represent the roots of the graph which is when it crosses the x-axis. The two solutions represent what x would equal when y=0 in this equation.