Answer:
Step-by-step explanation:
<CBD is congruent to <ABE by Vertical Angles
<ABC is congruent to <DBE by Vertical Angles
Answer:
12x-7y+3z
Step-by-step explanation:
6+9=15
y+9=x
x=30
y+9=30
y=21
10 days is twice the half-life. After 5 days, can expect

grams to remain; after another 5 days, you'd be left with

grams.
Answer:
13
Step-by-step explanation:
First drop the line.
How many units is it from Point r to the x axis?
12.
How many units is it from Point r to the y axis?
5.
Now we can use the Pythagorean Theorem.
