kaylarhys6068 kaylarhys6068
  • 10-06-2018
  • Mathematics
contestada

Find the dimensions of a rectangle whose width is 10 miles less than its length and whose area is 75 square miles.

L= ?
W= ?

Respuesta :

mkryukova19 mkryukova19
  • 10-06-2018
length = L
width =( L-10)

Area of rectangle =L*(L-10)

L*(L-10) = 75
L²-10L-75 = 0            -75= (-15)*5,        -10= - 15+ 5
(L-15)(L+5)=0
L=15,L=-5

We can take only positive root,
so L=15 mi.
W=L-10=15-10=5
W=5 mi

Answer: L=15 mi,    W=5mi.

Answer Link

Otras preguntas

What does a biological catalyst do? Lowers activation energy All of these Is not used up during reactions Speeds up reactions
you are learning a list of items for a test by relating the items to each other and to information that you already have stored in memory. which type of rehears
How many atoms are AI(OH)3 ?​
Patrick took out a loan for $500 at 4.2% simple interest. If he pays it back in 2 years, how much interest will he have to pay?
Help help help help help help help math math
John made 357$ for 17 hours of work. At the same rate, how many hours would he have to work to make $237???
pia is planting flowers. The number of tulips she plants is 4 more than half the number of daisies
How do you use a toilet? Explain with details if possible.
When you first purchase a notebook, make sure you have a ____ CD containing the installed OS so you can recover from a failed hard drive.
I need help plz. You have to write an equation from the graph, you either multiply, divide, add or subtract