Answer:
Answer 21ab
Step-by-step explanation:
First you do 3 times 3a which you get 9a then to 3 times 4b and you get 12b. So 12b plus 9a equals 21ab
If you dived 49 by 7 you will get 7. So if you multiply 7 x 7 you get 49.
Answer:
400 to 500 is c
400 to 600 is b
300 to 700 is e
400 t0 700 is d
500 to 700 is a
Step-by-step explanation:
![\dfrac{x_1+x_2+\cdots+x_{99}+x_{100}}{100}=51.28](https://tex.z-dn.net/?f=%5Cdfrac%7Bx_1%2Bx_2%2B%5Ccdots%2Bx_%7B99%7D%2Bx_%7B100%7D%7D%7B100%7D%3D51.28)
which means the sum of the 100 numbers must be