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4vir4ik [10]
3 years ago
7

Linda purchased a prepaid phone card for $30. Long distance calls cost 13 cents a minute using this card. Linda used her card on

ly once to make a long distance call. If the remaining credit on her card is $25.45, how many minutes did her call last?
Mathematics
1 answer:
Basile [38]3 years ago
5 0

Answer:35 minutes

Step-by-step explanation:

$30.00 - $25.45= $4.55/$.13= 35 minutes

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Y=7×2^t/30 what is the equation solved for t​
CaHeK987 [17]

Answer:

Option C

Step-by-step explanation:

Given expression in the question is,

y = 7(2)^{\frac{t}{30}}

To get the value of t,

\frac{y}{7}=2^{\frac{t}{30}}

Take the log on both the sides of the expression,

log(\frac{y}{7}) = \text{log}[(2^{\frac{t}{30}})]

log(\frac{y}{7}) = \frac{t}{30}(\text{log2})

t = 30(\frac{\text{log}\frac{y}{7}}{\text{log}2} )

t = 30[\text{log}_2(\frac{y}{7})] [Since, \frac{\text{loga}}{\text{logb}}=\text{log}_a(b)}]

Therefore, Option C will be the answer.

3 0
3 years ago
Given f(x)=-2x^3 + 3x^2 , find the equation of that tangent line of f at the point where x=2.
trapecia [35]

Step 1: Find f'(x):

f'(x) = -6x^2 + 6x

Step 2: Evaluate f'(2) to find the slope of the tangent line at x=2:

f'(2) = -6(2)^2 + 6(2) = -24 + 12 = -12

Step 3: Find f(2), so you have a point on y=f(x):

f(2) = -2·(2)^3 + 3·(2)^2 = -16 + 12 = -4

So, you have the point (2,-4) and the slope of -12.

Step 4: Find the equation of your tangent line:

Using point-slope form you'd have: y + 4 = -12 (x - 2)

That is the equation of the tangent line.

If your teacher is picky and wants slope-intercept, solve that for y to get:

y = -12 x + 20

5 0
3 years ago
Determine the direction that this parabola opens y=-4x^2-8x-13
Mazyrski [523]

Answer:

The direction that the paraboa y=-4x^2-8x-13 open is

Down

4 0
3 years ago
The band is raising money for their spring trip. they need to raise at
Andrews [41]

The inequality that can be used  to determine the number of boxes of donuts, d, they must sell in order to meet their goal is $1500 ≥ $575 + $5d.

<h3>What is the inequality?</h3>

Here are inequality signs and what they denote:

  • > means greater than
  • < means less than
  • ≥ means greater than or equal to
  • ≤ less than or equal to

Total amount that needs to be raised ≥ amount made at the fruit sale + (profit per box x number of boxes)

$1500 ≥ $575 + $5d

To learn more about inequality, please check: brainly.com/question/5031619

#SPJ1

8 0
2 years ago
Can movement of matter cannot occur without energy transfer
Aleks04 [339]
Yes: example-because if u are running u are using energy
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