#### Answer

$(7 \cdot 10)x$;
$70x$

#### Work Step by Step

RECALL:
The associative property of multiplication states that for any real numbers a, b, and c:
$a(bc) = (ab)c$
Use this property to obtain:
$7(10x) =(7\cdot 10)x$
Simplifying gives:
$=70\cdot x
\\=70x$