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4 years ago

Find the value of 5x-10 given that - 2x +7=3.

Mathematics

1 answer:

inysia [295]4 years ago

8 0

Answer:

Step-by-step explanation:

-2x+7=3

First you want to get the variable alone. To do that you need to subtract 7 from both sides

-2x+7(-7)=3(-7)

-2x=-4

Next you need to divide -2 on both sides to isolate the variable.

-2x/-2=-4/-2

-2/-2 is 0 and -4/-2 is positive 2 because a negative divided by a negative is positive.

x=2

Since x=2 you can plug in 2 into 5x-10 to get the final answer.

5(2)-10

10-10

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3 years ago

1) a) The formula for simple interest is:

Grace [21]

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3 years ago

What is the volume in cubic centimeters of a right circular cone with radius 2 centimeters and height 9 centimeters?

andreev551 [17]

Answer:

$V = 37.7cm^3$

Step-by-step explanation:

The formula for the volume of a cone is:

$V = \frac{1}{3} \pi r^2h$

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- Height = 9cm

Let's plug these into the equation:

$V = \frac{1}{3} \pi (2)^2(9)$

Now solve:

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3 years ago

300 juniors at Central High School took the ACT last year. The scores were distributed normally with a mean of 24 and a standard

Usimov [2.4K]

Answer:

150 students

Step-by-step explanation:

According to statement we have the following information

number of juniors=n=300

mean score=24

standard deviation score=4

The number of students that score above 24 is determined by

Number of students score above 24=number of juniors* P(student score above 24)

P(student score above 24)=P(x>24)=P(x-mean/sd>24-24/4)=P(z>0)=0.5.

Students score above 24=np=300*0.5=150

Hence there are 150 students scored above 24.

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4 years ago

Clare earned a total of $12 for 2 hours of yard work. How many hours in all will it take Clare

Luba_88 [7]

Answer:

3 hours

Step-by-step explanation:

$12 = 2hours

Find how much Clare was paid for one hour

Total money earned ÷ number of hours = wage per hour

12 ÷ 2 = $6 per hour

set up equation

6x = 18

This equation says 6 dollars an hour × number of hours = $18

To solve for this equation, divide both sides by 6 (this isolates the variable)

6x ÷ 6 = 18 ÷ 6

1x = 3

x = 3

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3 years ago