Answer:
Seventh term is 64
Sum of the first seven terms is 127
Step-by-step explanation:
The common ratio is 2
n = 7 and the first term is 1. So,

Seventh term is 64



Sum of the first seven terms is 127
Answer:
expanded I believe or the first one good luck
B. 18
Explanation
The dot product or scalar product is an algebraic operation that takes two equal-length sequences of numbers (usually coordinate vectors), and returns a single number
it is given by.

so, we can find the dot product by multiplying the corresponding values in each vector and adding them together
Step 1
get the dot product
let

then

therefore, the answer is
B. 18
I hope this helps you
Let the number of saxophone players be
.
Then, the number of trumpet players will be 
If saxophone players are three times the number of trumpet players then we have the relation

This is a linear equation in s. we expand bracket to obtain,

We group like terms to get,


This implies that

The number of trumpet players are;

Therefore there are 5 trumpet players.