All categories

3 years ago

Maya bought a new iphone case for $40. Now, it is on sale for $25. Find the percent of change in the

Mathematics

1 answer:

bulgar [2K]3 years ago

4 0

Answer:

Step 1: $15

Step 2: 38%

Step-by-step explanation:

Step 1:

40 - 25 =15.

Therefore, the price would decrease by $15.

Step 2:

40 multiplied by .38 equals 24.80. You would round that up to 25. If you plugged in 37%, it would equal 25.20, which is over the price. Therefore the price decreased by 38%.

You might be interested in

According to the graph what is the value of the constant in the equation below

attashe74 [19]

Answer:

I don't know the answer. .

3 0

2 years ago

The graph of the equation 2x2 + xy + y2 = 4 is the tilted ellipse pictured below; i.e. the points (x,y) in the plane that satisf

mihalych1998 [28]

Answer:

The slope of tangent at point (1,-2) is $\frac{2}{3}$ .

Step-by-step explanation:

The given equation of ellipse is

$2x^2+xy+y^2=4$

Differentiate both sides with respect to x.

$\frac{d}{dx}(2x^2+xy+y^2)=\frac{d}{dx}(4)$

$\frac{d}{dx}(2x^2)\frac{d}{dx}(xy)+\frac{d}{dx}(y^2)=\frac{d}{dx}(4)$

$4x+x\frac{dy}{dx}+y+2y\frac{dy}{dx}=0$

$(4x+y)+(x+2y)\frac{dy}{dx}=0$

$\frac{dy}{dx}=-\frac{4x+y}{x+2y}$

Calculate the value of \frac{dy}{dx} at (1,-2).

$\frac{dy}{dx}_{(1,-2)}=-\frac{4(1)+(-2)}{(1)+2(-2)}$

$\frac{dy}{dx}_{(1,-2)}=-\frac{2}{-3}$

$\frac{dy}{dx}_{(1,-2)}=\frac{2}{3}$

Therefore the slope of tangent at point (1,-2) is $\frac{2}{3}$ .

3 0

2 years ago

Read 2 more answers

3. Theresa has 20 coins that are dimes and quarters. Together

KiRa [710]

Answer:

15 dimes
5 quarters

Step-by-step explanation:

Let q represent the number of quarters Theresa has. Then the value of her coins is ...

0.25q + 0.10(20 -q) = 2.75

0.15q = 0.75 . . . . . . . . . subtract 2.00, collect terms

q = 0.75/0.15 = 5

Theresa has 5 quarters and 15 dimes.

3 0

3 years ago

The product of a number and negative three is twenty-seven. Which of the following could represent this statement?

Arturiano [62]

Answer:

Step-by-step explanation:

The product of a number and negative three is twenty-seven.

<em>n - </em><em>a number</em>

the product of a number and negative three: <em>n · (-3) = -3n</em>

5 0

2 years ago

Read 2 more answers

The function p(x) is an odd degree polynomial with a negative leading coefficient.

Aliun [14]

A because it’s the right answer

4 0

2 years ago