Please help! What is the base?

How do you use the additive inverse to evaluate an expression that uses subtraction in a full sentence

What is the solution for 6 - 7/8? explain the steps.

Sera sells t-shirts at the beach. she believes the price of a t-shirt and the number of t-shirts sold are related. she has been experimenting with different prices for the t-shirts. she has collected a data set with five pairs of data; each consists of the price of a t-shirt and the number of shirts sold. the independent variable, which will go on the x-axis, is . the dependent variable, which will go on the y-axis, is the