What are the given rates??
D. It is D because x=the number of days times 2 and the 5 you collected
<span>Let x be the second number.
Let 2x+7 be the first number.
x+2x+7=25
3x+7=25
3x=25-7
3x=18
x=18/3
x=6
2x+7=19
The two numbers are 19 and 6.</span>
13 + 21 = 13- -21
The minus sign and negative cancel each other out.