Add and turn to simplest form.

The answer is

Step-by-step explanation:

First of all we must make sure that the surds have equal roots

For 5√490

For 4√40

So we have

Using the rules of surds simplify the expression

That's

So we have

We have the final answer as

Hope this helps you

step-by-step explanation:

ok so im not 100% sure but you would start by adding 5.1t and 1.9t beacuse they have the same variable. that is 7t.   then add -3.6 + 1.2 which is -2.4

so then keep that as -2.4 + 7t. i apologize if this is incorrect. best luck on your test < 3