PLS HELP ASAP ILL mark u as brainlist!!

Its C.

Step-by-step explanation:

31+90+x=180

x=59

there is only one option with the answer 59 for the 4th angle therefore no need to find the rest

C

Each triangle sector = 180º

m<1 must be 90º because combined with the angle to the left it is 180º (supplementary angles)

m<2 is 31º because it is basically the same angle as <R

m<3 is the same as m<4

to figure out angles 3 & 4, you need to:

31 + 90 + x = 180

121º + x = 180

180 - 121 = 59º

m<3 & m<4 is 59º

Numerical expressions contain numbers, while algebraic expressions contain variables and numbers.

Numerical Expression

"Difference" indicates that we'll be subtracting 13 from 48.

48 - 13 = 35

Algebraic Expression

Variables represent the unknown number, in this case the difference between 48 and 13. Let d represent the difference between the two.

48 - 13 = d

35 = d