7. plz help ill mark brainliest!!

Step-by-step explanation:

Probability is a way of describing the chance of an event happening. The general format that one uses for describing the probability happening is the following,

In the given situation, there are (10) painters, (3) sculptors, and (5) photographers. One can find the total number of artists by adding up the number of artists of different types,

(painters) + (sculptors) + (photographers)

= 10 + 3 + 5

= 18

Now, to find the probability of selecting either a sculptor or photographer, one must add up the number of photographers and the number of sculptors, and then put the result over the total number of artist,

(sculptors) + (photographers)

= 3 + 5

= 8

Now use the formula for probability,

Simplify, remove common factors from the numerator (number over the fraction bar) and denominator (number under the fraction bar),