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Yuliya22 [10]
2 years ago
7

Laila purchased a prepaid phone card for $25 . Long distance calls cost 24 cents a minute using this card. Laila used her card o

nly once to make a long distance call. If the remaining credit on her card is $13.72 , how many minutes did her call last?
Mathematics
1 answer:
tresset_1 [31]2 years ago
4 0

Answer:

The call lasted for 47 minutes.

Step-by-step explanation:

It is given that:

Value of prepaid card = $25

Cost per minute of long distance call = 24 cents = $0.24

Remaining credit = $13.72

Let,

x be the number of minutes

y be the remaining amount

y = 25 - 0.24x

13.72 = 25 - 0.24x

0.24x = 25 - 13.72

0.24x = 11.28

Dividing both sides by 0.24

\frac{0.24x}{0.24}=\frac{11.28}{0.24}\\x=47

Therefore,

The call lasted for 47 minutes.

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Skyler goes to a school which has 1000 students in it.
Dmitry [639]

Answer:

it's estimated that 750 students in the whole school dislike the 8:30am start time.

Step-by-step explanation:

Since 30 of the 40 students said "no", it means 30/40, or 3/4 of the random sample disliked the 8:30am start time. Multiply this by the whole population: 1,000 × (3/4) = 750.

Another way to check this is using 10/40 = .25 and doing 1000x.25 = 250 (the amount of students who liked it). Then subtract from whole population and it's 750.

5 0
2 years ago
Solve for x. mx2 + y e = b
m_a_m_a [10]
X=(b/2m)*y-e is the answer I believe.
7 0
3 years ago
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El volumen de un cubo, cuyos lados miden 4,5 cm corresponde a: A- 91 cm2 B- 91,1 cm C- 91 cm3
Leya [2.2K]

Answer:

La respuesta correcta es la opción C: 91 cm³.

Step-by-step explanation:

La fórmula del volumen de un cubo es la siguiente:

V = a^{3}

En dónde:

a: es cada lado del cubo = 4,5 cm

Entonces, el volumen del cubo es:

V = a^{3} = (4,5 cm)^{3} = 91.1 cm^{3} \approx 91 cm^{3}

Por lo tanto, la respuesta correcta es la opción C: 91 cm³.  

Espero que te sea de utilidad!

6 0
3 years ago
10 points lol 6th grade math coordinate points
mart [117]

i think it is the last one


5 0
3 years ago
James drew a scaled version of Triangle J using a scale factor of 4 and labeled it Triangle K. The base of triangle J is 5 units
Andreas93 [3]

Answer:

The area of triangle K is 16 times greater than the area of triangle J

Step-by-step explanation: so...... If Triangle K is a scaled version of Triangle J

then

Triangle K and Triangle J are similar

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