Answer:
100
Step-by-step explanation:
Equations in parentheses get solved first: 30-10=20 and 20x5=100
The second one is correct
Answer:
I can't tell what the triangle is
Step-by-step explanation:
Answer:
He should buy a 50 inch TV
Step-by-step explanation:
Using Pythagorean theorem the TV cabinet has a diagonal of :

Sum of n terms in a geometric progression is given by Sn = a1 (1 - r^n) / (1 -r)
3( 1 - 4^6) / (1-4)
= 4,095