Answer:
x = 70
Step-by-step explanation:
Interior angles of a 4 sided shape = 360
80+70 = 150
360-150 = 210
210/3 = 70
4(x+1) is the only one equal to 0
Draw a rectangle 37 cm by 42 cm and then count how many 1cm by 1cm squares are inside it.
Answer:
sum of terms: 55550
Explanation:

Here the number of terms:
1100 ÷ 11 = 100
Using the Formula:

