Answer: Sal used a debit card and paid a total of $324.80 for the stereo. (I took the test too)
Step-by-step explanation: Multiply $21.30 by 18 months. Then subtract the interest, $58.60, from the product because Sal paid immediately with a card which implies using a debit card. You get $324.80.
Answer:
9+11i
Step-by-step explanation:
12-3=9
4i-(-7i)=11
Answer:

Step-by-step explanation:
In order to find what score Alex must earn to have an average of 86 on all his tests, we need to first note what the formula to find the average of a data set is.

What the formula means is that we have to add up all the values then divide by the total number of values.
Let's represent our unknown number as
.
(since we want AT LEAST an 86).
Let's solve this inequality for x.
So, Alex must score at least an 87% on his next quiz to have an average of 86%.
Hope this helped!
Answer:
(6,41)
x=6
y=41
Step-by-step explanation:
I did it algebraically to solve for x and y, and I also graphed both of them and found the point where they intersect. It’s in the image below.
Hope this helps! :)