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Ludmilka [50]
4 years ago
7

Question 3 Kala purchased a prepaid phone card for $30 . Long distance calls cost 13 cents a minute using this card. Kala used h

er card only once to make a long distance call. If the remaining credit on her card is $25.06 , how many minutes did her call last?
Mathematics
2 answers:
Finger [1]4 years ago
8 0
$30.00-$25.06=$4.94. Kala used $4.94 on her card for the last call. 13cents per minute, divide 4.94/13=38, her last call 38 minute.
sweet-ann [11.9K]4 years ago
5 0
Her call lasted 12 minutes
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A large school district is reevaluating its teachers' salaries. They have decided to use regression analysis to predict mean tea
inna [77]

Answer:

a) Y = 35,422.12

b) Y = 29,367.67

c) 1,210.89

Step-by-step explanation:

The salary of teachers is forecasted by the following equation,

Y = 23,313.22 + 1,210.89X

Where Y is the forecasted salary and X is the years of experience.

(a) If a teacher has 10 years of experience, what is the forecasted salary?

Here we have X = 10

Y = 23,313.22 + 1,210.89(10)

Y = 23,313.22 + 12,108.9

Y = 35,422.12

(b) If a teacher has 5 years of experience, what is the forecasted salary?

Here we have X = 5

Y = 23,313.22 + 1,210.89(5)

Y = 23,313.22 + 6,054.45

Y = 29,367.67

(c) Based on this equation, for every additional year of service, a teacher could expect his or her salary to increase by how much?

For every additional year of service, a teacher could expect an increase of  1,210.89.

7 0
3 years ago
Find dy/dx for 4 - xy = y^3
storchak [24]

Answer:

\frac{dy}{dx}=-\frac{y}{3y^2+x}

Step-by-step explanation:

4-xy=y^3

dy/dx=?

\frac{d(4-xy)}{dx}=\frac{d(y^3)}{dx}\\ \frac{d(4)}{dx}-\frac{d(xy)}{dx}=3y^{3-1}\frac{dy}{dx}\\ 0-(\frac{dx}{dx}y+x\frac{dy}{dx})=3y^2\frac{dy}{dx}\\ -(1y+x\frac{dy}{dx})=3y^2\frac{dy}{dx}\\ -(y+x\frac{dy}{dx})=3y^2\frac{dy}{dx}\\ -y-x\frac{dy}{dx}=3y^2\frac{dy}{dx}

Solving for dy/dx: Addind x dy/dx both sides of the equation:

-y-x\frac{dy}{dx}+x\frac{dy}{dx}=3y^2\frac{dy}{dx}+x\frac{dy}{dx} \\ -y=3y^2\frac{dy}{dx}+x\frac{dy}{dx}

Common factor dy/dx on the right side of the equation:

-y=(3y^2+x)\frac{dy}{dx}

Dividing both sides of the equation by 3y^2+x:

\frac{-y}{3y^2+x}=\frac{(3y^2+x)}{3y^2+x}\frac{dy}{dx}\\ -\frac{y}{3y^2+x}=\frac{dy}{dx}\\ \frac{dy}{dx}=-\frac{y}{3y^2+x}

7 0
3 years ago
$640,3%,2 years?!?! Plz explain!!
mrs_skeptik [129]
I am pretty sure it is talking about interest and $640 is what you start with, with a 3% interest for 2 years
5 0
3 years ago
If x-2 is one of the factors of x^4-kx^2+4, find the value of k.
Andrei [34K]

Step-by-step explanation:

Given expression is x⁴-kx²+4 =0

x−2 is a factor of the given expression.

So, x=2

Substitute in the equation, we get

2⁴-k(2)²+4

⇒16+4k+4=0

⇒4k=−20

⇒k=−5

8 0
3 years ago
HELLO!! :) CAN U PLEASE HELP ME WITH THIS PROBLEM? I WILL GIVE YOU BRAINLIEST AND A THANKS!! PLEASE EXPLAIN TOO!!
miskamm [114]

Answer:

21square feet

Step-by-step explanation:

Count the whole squares first.

if each square is one square foot then 18 whole squares will be 18×1= 18 square feet

add halves (aproximate halves) together. (3 in total)

Therefore A= 18 +3

= 21 square feet

3 0
2 years ago
Read 2 more answers
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