Kiersten runs a website that people learn programming. every month, kiersten receives a subscription fee of \$10$10 from each of the subscribers to her website. last month, the website had 100100 subscribers. this month, 3030 new members joined the website, and 1010 members cancelled their subscription.

$1200

Step-by-step explanation:

10 x 100 = 1000

$1000 made last month

30 x 10 = 300

$300 made this month (not including the cancellations)

10 x 10 = 100

$100 lost due to cancellations

300 - 100 = 200

$200 this month

Final calculation: This months income + last months income = total income

200 + 1000 = 1200

$1200 made in the combined months

proofs involving isosceles triangles often require special consideration because an isosceles triangle has several distinct properties that do not apply to normal triangles.(more about triangle types) therefore, when you are trying to prove that two triangles are congruent, and one or both triangles, are isosceles you have a few theorems that you can use to make your life easier.

step-by-step explanation:

an isosceles triangle has two congruent sides and two congruent angles. the congruent angles are called the base angles and the other angle is known as the vertex angle. ∠bac and ∠bca are the base angles of the triangle picture on the left. the vertex angle is ∠abc