Given: ab is a tangent of x. ab = 70 and xd = 12. what is the measure of db?

Answer = 74

Since angle DAB is a right angle (because the line is a tangent), then you can use the pythagorean theorem to calculate the length of DB.

XD = 12 and since XD is the radius of the circle, then you know that doubling it gives you the diameter, AD, which is then equal to 24.

The pythagorean theorem says that a^2 + b^2 = c^2 so then 70^2 + 24^2 = (DB)^2.

4900 + 576 = (DB)^2. 
5476 = (DB)^2
DB = 74

Thank you for posting your question here. If Samantha's garden has 18 carrots plants it means it occupies 25% of the garden. Since tomato is also 25% then it also have 18 tomato plants and for daises it has 36 plants since 18x2 is 36. Therefore total amount of plant is 72.