An online bookstore sells novels and magazines.
Each novel sells for $4, and each magazine sells for
$1. If Sadie purchased a total of 11 novels and
magazines that have a combined selling price of $20.
how many novels did she purchase?

The number of novels purchased was 3

Step-by-step explanation:

Let

x ----> the number of novels purchased

y ---> the number of magazines purchased

we know that

Sadie purchased a total of 11 novels and  magazines that have a combined selling price of $20

so

----> equation A

----> equation B

Solve the system of equations by graphing

Remember that the solution is the intersection point both graphs

using a graphing tool

The solution is the point (3,8)

see the attached figure

therefore

The number of novels purchased was 3

answer:   35 % is the probability of a late departure or an early arrival.

step-by-step explanation:

let l represents the late departure and e represents the early departure.

then, according to the question,

p(l) = 12 %,   p(e) = 27 % and = 4 %

and, we have to find out,

but, we know that,

which is the required equation that will use to find the probability of a late departure or an early departure.

therefore,   the probability of a late departure or an early arrival =   35 %