#### Answer

a. $1.5$
b. $1.51$
c. $1.507$
d.$1.5065917$

#### Work Step by Step

Rounding $1.5065916514855$ to:
a. the nearest tenth
$1.5$
(The digit behind the tenth digit is 0, so we keep the tenth digit the same and remove all the digits behind it).
b. the nearest hundredth
$1.51$
(The digit behind the hundredth digit is 6, so we increase the hundredth digit by 1 and remove all the digits behind it).
c. the nearest thousandth
$1.507$
(The digit behind the thousandth digit is 5, so we increase the thousandth digit by 1 and remove all the digits behind it).
d. seven decimal places
$1.5065917$
(The digit in the 8th decimal place is 6, so we increase the digit in the 7th decimal place by 1 and remove all the digits behind it).