#### Answer

$10(x+3)$

#### Work Step by Step

Factoring a Monomial From a Polynomial
1. Determine the greatest common factor of all terms in the polynomial.
2. Express each term as the product of the GCF and its other factor.
3. Use the distributive property to factor out the GCF.
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10 is the greatest integer factor of 10 and 30,
There are no common variable factors.
GCF = 10
$10x+30=10\cdot x+10\cdot 3$
... use the distributive property
= $10(x+3)$