Question 70982: Problem#22
Adriana took 2h longer to drive 360 mi on the first day of a trip than she took to drive 270 mi on the second day. If her speed was the same on both days, wha was the driving time each day?
Problem#26
A plane flies 720 mi against a steady 30-mi/h headwind and then returns to the same point with the wind. If the entire trip takes 10h, what is the plane's speed in still air?
Problem#34
Kevin earned $165 interest for 1year on an investment of $1500. At the same rate, what amount of interest would be earned by an investment of $2500?
Answer by hailu(13)   (Show Source):
You can put this solution on YOUR website! problem#34
at an investment of $1500- interest is $165
so,at an investment of $2500- interest will be?
-use the cross product method to find (x)
$1500=$165
$2500=x
x=($2500*$165)/$1500
x=$412500/$1500
x=$4125/$15
-yo answer will be
x=$275
-if u want to check ur answer, substitute (x), into your cross product
$1500=$165
$2500=$275
-and then (criss/cross)
$1500*$275=$2500*$165
$412500=$412500
TRUE
|
|
|
