The answer is <span>C.) 2
The general form of formula is
y = a </span><span>• r^x
y - the total number of bacteria after x period of time
a - the initial number of bacteria
r - growth rate
x - period of time
Let's compare:
</span>y = a • r^x
<span>y = 280 • 2^x
Since r = 2, the growth rate is C.) 2</span>
The lines that intersect to form square corners that are right angles are called: C. perpendicular lines.
<h3>What are Perpendicular Lines?</h3>
Perpendicular lines are lines that intersect each other at a point and forms for square corners that are right angles at that point of intersection.
An example of perpendicular lines is shown in the image attached below.
Thus, the lines that meet to form right angles are called: C. perpendicular.
Learn more about perpendicular lines on:
brainly.com/question/1202004
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It's 9. (I don't use inches in Canada but I made everything in inches so hopefully it helped)