Ricky made 86 phone calls in 3 months. in the first month she made 21 calls, and in the second month she made 19 calls. how many calls did she make in the third month?

according to the triangle sum theorem, all the angles in a triangle must add up to 180 degrees. if we know one angle is already 90, we do 180-90=90. the other 2 angles must add up to 90, exactly.

step-by-step explanation:

h * s * a

h = history teacher

s = science teacher

a =   art teacher.

i see no data table, but just multiply the number of history teachers, science teachers, and art teachers.

the answer is "add 2y and y"

step-by-step explanation:

you need to collect the like terms first.