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scZoUnD [109]
2 years ago
12

Evaluate (3x + 5) - (2x + 7) when x = 5.

Mathematics
2 answers:
Bingel [31]2 years ago
8 0

Answer:

The answer is  20 - 17 = 3 [Choice B.]

Step-by-step explanation:

Put x = 5 into the formula (3x + 5) - (2x + 7)

[3(5)+5] - [2(5)+7]

= [15 + 5] - [10 + 7]

=20 - 17

= 3

nataly862011 [7]2 years ago
6 0

Answer:

The answer is B. 20 - 17 = 3

Step-by-step explanation:

( 3x + 5) - (2x + 7)...... x = 5

( 3(5) + 5) - ( 2(5) + 7)

( 15 + 5) - (10 + 17)

20 - 17 = 3

Thank you :)

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PLEASE someone help its due tonight im almost done
marusya05 [52]
<h3>Answers:</h3>
  • 48 seconds
  • 3624 feet

========================================================

Explanation:

x = number of seconds that elapse

y = altitude (aka height) of the plane

The equation for plane A is

y = 20.25x+2652

because it starts off at 2652 ft in the air, and then adds on 20.25 feet per second which is what the 20.25x describes

The equation for plane B is

y = 75.5x

The y intercept is zero because plane B starts on the ground, aka height 0.

------------------

The system of equations is

\begin{cases}y = 20.25x+2652\\y = 75.5x\end{cases}

If we want to know when they'll reach the same height (y), then we can set the two right hand sides equal to each other and solve for x.

75.5x = 20.25x+2652

75.5x-20.25x = 2652

55.25x = 2652

x = (2652)/(55.25)

x = 48

The two planes reach the same altitude at exactly <u>48 seconds</u>

That altitude is <u>3624 feet</u> because

  • y = 20.25*x + 2652 = 20.25*48+2652 = 3624
  • y = 75.5*x = 75.5*48 = 3624

Notice I plugged x = 48 into each equation and I got the same y value of y = 3624. This helps confirm the answers.

7 0
2 years ago
Find the volume of a right circular cone that has a height of 2.7 ft and a base with a diameter of 14.4 ft. Round your answer to
irina1246 [14]

Answer:

V≈146.57ft^3

Step-by-step explanation:

V=πr^2·h/3  since d is 14.4, we would divide it by 2 to find the radius which is 7.2

so V= π(7.2)^2· (2.7)/3

V≈146.57ft^3

It would be greatly appreciated if you gave me the brainlest

3 0
2 years ago
Solve the equation. Check the solution.<br> 6/7x= - 18
dexar [7]

Answer:

x= -21

Step-by-step explanation:

6/7x=-18

divide both sides by 6/7

------------

x= -21

------------

8 0
3 years ago
Read 2 more answers
the mass of jam when full is 450g. the jam has a mass of 80g. find the total mass of 3 full jars of jam in kilograms and grams​
anastassius [24]

Answer:

the answer is 1350

Step-by-step explanation:

add 450 together three times or multiply by 3

450 x 3 = 1350

5 0
4 years ago
Read 2 more answers
Convert the following units of time. a. 5 years to days b. 8 weeks to days c. 7 days to weeks d. 336 hours to seconds e. 12 hour
AysviL [449]

Answer:

A. 1,825 days

B. 56 days

C. 1 week

D.  1,209,600 seconds

E. 43,200 seconds

F. 2 hours

Step-by-step explanation:

A. 1 year = 365 days, then

5 years = 5\cdot 365 days = 1,825 days.

B. 1 week = 7 days, then

8 weeks = 8\cdot 7 days = 56 days.

C. 7 days = 1 week.

D. 1 hour = 3,600 seconds, then

336 hours = 336\cdot 3,600 seconds = 1,209,600 seconds.

E 12 hours = 12\cdot 3,600 seconds = 43,200 seconds.

F. 3,600 seconds = 1 hour, then

7,200 seconds = \dfrac{7,200}{3,600} hours = 2 hours.

3 0
3 years ago
Read 2 more answers
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