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Alekssandra [29.7K]

3 years ago

12

A bookstore had 45 copies of a magazine. Yesterday, it sold 2/3 of them. Today, it sold 1/3 of what remained. How many copies do

es the bookstore have left?

1 answer:

Ket [755]3 years ago

6 0

After the first day, 1/3 of the original amount remained:

... (1/3)·45 = 15

After the second day, 2/3 of that amount remained:

... (2/3)·15 = 10

The bookstore has 10 copies left.

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The function f(x) = 32,000(.723)x models the value of the car after x years. What is the percent change?

Zielflug [23.3K]

.723 is the percentage change, just move the decimal over 2 places. 72.3%

6 0

3 years ago

Mya wants to buy a sweater from a store. The original price of the sweater is $40. The sweater is on sale for 10% off the origin

Nimfa-mama [501]

$36
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3 0

2 years ago

Which of the following is a solution to the equation "y=3x-1"

nalin [4]

we have

$y=3x-1$

we know that

If the point is an equation solution, it must satisfy the equation.

<u>case a</u>) $(4,1)$

Substitute the values of x and y in the equation

$1=3*4-1$

$1=12-1$

$1\neq11$ -------> the point is not solution of the equation

<u>case b</u>) $(2,5)$

Substitute the values of x and y in the equation

$5=3*2-1$

$5=6-1$

$5=5$ -------> the point is solution of the equation

<u>case c</u>) $(4,3)$

Substitute the values of x and y in the equation

$3=3*4-1$

$3=12-1$

$3\neq11$ -------> the point is not solution of the equation

<u>case d</u>) $(0,-3)$

Substitute the values of x and y in the equation

$-3=3*0-1$

$-3\neq-1$ -------> the point is not solution of the equation

therefore

<u>the answer is</u>

The point $(2,5)$ is solution of the equation

4 0

3 years ago

Read 2 more answers

What are the zeros of the function f(x) = x2 + 5x + 5 written in simplest radical form? Quadratic formula: x = StartFraction neg

Harman [31]

Answer:

$x=\frac{-5(+/-)\sqrt{5}} {2}$

x = StartFraction negative 5 plus or minus StartRoot 5 EndRoot Over 2 EndFraction

Step-by-step explanation:

we know that

The formula to solve a quadratic equation of the form

$ax^{2} +bx+c=0$

is equal to

$x=\frac{-b(+/-)\sqrt{b^{2}-4ac}} {2a}$

in this problem we have

$f(x)=x^{2} +5x+5$

equate the function to zero

$x^{2} +5x+5=0$

so

$a=1\\b=5\\c=5$

substitute in the formula

$x=\frac{-5(+/-)\sqrt{5^{2}-4(1)(5)}} {2(1)}$

$x=\frac{-5(+/-)\sqrt{5}} {2}$

therefore

x = StartFraction negative 5 plus or minus StartRoot 5 EndRoot Over 2 EndFraction

6 0

3 years ago

Read 2 more answers

11 + 10 × 4 ÷ 5 – 11

Damm [24]

Answer: the answer is 8

Step-by-step explanation: First, you multiply 10 x 4. After that, you divide the answer, 40, by 5. After that you add 11 and then subtract 11, making 11 and 11 cancel out. So the answer is 8.

7 0

3 years ago