first question
Kristen make $16 per hour
last week he worked for 34 hours
1 hour ==== $16
35 hours ==== $x
cross multiplication
x * 1 = 16 x 34
x = $544
Second question
for mark
make $14 per hour
he worked 46 hours last week
total amount made
1 hour ===== $14
46 hours =====$x
1 * x = 14 x 46
x = $644
Mark make $644 last week
for the fourth question
if mark and kristen combined their savings
mark make $644 and kristen make $544
their saving combines is
$644 + $544
= $1,188
Their saving combines is $1, 188
if mark works for 46 hours and make $644
if marks works for 34 hours and make $544
how many hours will they work
let the number of hours be x
equating the two equation