Answer:
sum of twice a number and three is 21
2x + 3 = 21
x = 9
Answer:
Step-by-step explanation:
z*9-10
9z-10
hope i helped.
Answer:
Step-by-step explanation:
7/4 x 2/3= 7/2 x 1/3= 7/6 = 1 1/6
Number of ways of picking a smaller number out of a bigger number is called combination.
Number of way of picking 3 stamps out of 4 is 4C3 (4 combination 3) = 4! / (3! x (4 - 3)!) = 4! / (3! x 1!) = (4 x 3 x 2 x 1) / (3 x 2 x 1 x 1) = 24 / 6 = 4 ways.
30×4=120 then multiply 75×4=340 then add 120+340=460
