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3 years ago

2. Which equation is equivalent to x+8 = 21?

Mathematics

1 answer:

lakkis [162]3 years ago

3 0

Answer:

The most obvious one i can think of would be

x = 13

Step-by-step explanation:

x + 8 = 21

x + 8-8 = 21-8

x = 13

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Andrew is about to leave for school. If he walks at a speed of 50 meters per minute, he will arrive 3 minutes after the bell rin

Mariana [72]

Answer:

The answer is: 13 minutes

Step-by-step explanation:

First Let us form equations with the statements in the two scenario

$time=\frac{distance}{speed}$

Let the time in which the bell rings be 'x'

1. If Andrew walks (50 meters/minute), he arrives 3 minutes after the bell rings. Therefore the time of arrival at this speed = (3 + x) minutes

$3 + x =\frac{distance}{50}\\distance = 50(3+x) - - - - - (1)$

2. If Andrew runs (80 meters/minute), he arrives 3 minutes before the bell rings. Therefore the time taken to travel the distance = (x - 3) minutes

$x - 3 = \frac{distance}{80} \\distance = 80(x-3) - - - - - (2)$

In both cases, the same distance is travelled, therefore, equation (1) = equation (2)

$50(3+x)=80(x-3)$

$150 +50x=80x-240\\$

Next, collecting like terms:

$150 + 240 = 80x - 50x\\390 = 30x\\30x = 390\\$

dividing both sides by 3:

x = 390÷30 = 13

∴ x = 13 minutes

7 0

2 years ago

I need help with twenty seven

Elanso [62]

Ben is taller
Ben: 5 5/16 feet = 1.61925 meters
Marcus: 5 7/24 feet = 1.6129 meters

3 0

2 years ago

Given the function h of x equals three times the square root x plus 1 end root minus 2, which statement is true about h(x)?

topjm [15]

A function assigns the values. The correct option is D.

<h3>What is a Function?</h3>

A function assigns the value of each element of one set to the other specific element of another set.

The given function $h(x)=3(\sqrt{x+1})-2$ when plotted on the graph will look as shown below. Therefore, the function is increasing on the interval (–1, ∞).

Hence, the correct option is D.

Learn more about Function:

brainly.com/question/5245372

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8 0

1 year ago

7. The double dot plot shows the weights in pounds of several housecats and small dogs. Which inference can be made based on the

VARVARA [1.3K]

Answer:

Step-by-step explanation:

For reference, the median for housecats is 11 and the median for small dogs is 9. So, by process of elimination, B is the correct answer.

7 0

2 years ago

Estimate <br> 72 x 362 / 0.49

andrew11 [14]

53191.8367347

thx for the points

3 0

2 years ago

Read 2 more answers