Always find the difference in prices first.
3.45 - 3.20 = $.25 difference 

Always divide the difference by the original price. Change this number into a per cent. 
.25/3.45 = .07246 = 7.2% decrease

6 0

3 years ago

Read 2 more answers

-5/4-(-1/6) help please

tiny-mole [99]

A way to add fractions that always works is to multiply each numerator by the denominator of the other, then express the sum of products over the product of the denominators.
$\dfrac{a}{b}+\dfrac{c}{d}=\dfrac{a}{b}\cdot\dfrac{d}{d}+\dfrac{c}{d}\cdot\dfrac{b}{b}\\\\=\dfrac{ad+bc}{bd}$

Here, you have
$\dfrac{-5}{4}-\dfrac{-1}{6}=\dfrac{-5\cdot6-(-1)\cdot4}{4\cdot6}=\dfrac{-26}{24}\\\\=\dfrac{-13}{12}=-1\frac{1}{12}$

The sum is -1 1/12

3 0

3 years ago

How do you solve for "r" in the literal equation "I=Prt"

Mrac [35]

R=I/Pt
hopefully this helps

8 0

3 years ago