What is an equation with more than one variable called

binomial

Step-by-step explanation: binomial means 2 variables, trinomial means 3 variables, and a polynomial is an equation with 4 or more variables.

Below

Step-by-step explanation:

Notice that:

● 14.2 = 14+0.2

● 15.8 = 15 +0.8

● 0.8+0.2 = 1

So:

● 14.2 +15.8 = 14+15 +0.2+0.8

● 14.2+15.8 = 14+1+15 = 15+15 = 30 (1)

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Notice that:

● 14.99 = 14+0.99

● 15.51 = 15+0.50+0.01

● 0.99 + 0.1 = 1

● 14.99+15.51 = 14+0.99+0.5+0.01

● 14.99+15.51= 14 + 1 +0.5

● 14.99+15.51 = 15+0.5 (2)

●(1)+(2) = 30 +15+0.5 = 45+0.5

So the total sum is 45.5 (45+0.5)