twice the sum of a number and 3, means you need to add the number to 3 first, then multiply by 2.
The correct expression would be 2(n+3)
9x-5, I guess, not sure, but I'm combining like terms. Hope it's right.
The answer is seven (7)
Explanation:
There are eight red flowers
There are ten white flowers
There are five yellow flowers
Add those together.
8+10+5 = 23
Subtract from the total number of flowers which is thirty.
30 - 23 = 7
