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wel
3 years ago
13

4.

Mathematics
1 answer:
erica [24]3 years ago
4 0

Answer:

20% decrease

Step-by-step explanation:

First, let's find the net decrease: Peter started at 80kg and his weight is now 64kg, which is a 16kg decrease. Next, we need to find what percentage of 80kg 16kg represents. First, let's find what part of 80 is 16:

16/80 = 1/5

To convert this to a percent, we need to find an equivalent fraction to 1/5 with a denominator of 100. To do this, we can multiply the numerator and denominator of 1/5 by 20, giving us 20/100, or 20%.

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The length of a train car is 50.6 feet. this is 5.8 feet less than six time the width. what is the width?
Aliun [14]
Let x be the width of the train; 

50.6ft =6x-5.8ft <--- solve for x 
50.6+5.8=6x 
56.4 ft=6x 
56.4/6=x 
9.4 ft = x 

Therefore the width of the train is 9.4 ft 

Hope I helped :)  
8 0
3 years ago
The sum of three consecutive integers is 915. what are the integers
ra1l [238]
(x-1)+x+(x+1)=915
3x=915
x=305

304, 305, 306
4 0
4 years ago
Which of the following represents a function?
Hitman42 [59]

Answer: C, a set of coords is only a function if it passes the vertical line test

Step-by-step explanation:

This is essentially the vertical line test. No two sets can have the same x value because it will fail the vertical line test. In answer a, -4 correlates to two y values. It fails the line test

B easily fails the test just by visually looking at it. It fails the line test

C has different x values so this looks promising. It passes the line test

D has the number 5 correlating with multiple y values. It fails the line test

7 0
3 years ago
Jackson and Jonah are both swimming. Jackson swims at 1350 meters per hour. Jonah swims at a speed of 1250 millimeters per secon
Vladimir [108]

For this question we will use the following relations.

100 centimeters=1 meter (or 1 centimeter= 0.01 meter)

10 millimeter=1 centimeter (or 1 mm=0.1 cm)

60 minutes = 1 hour (or 1 min=\frac{1}{60} hour)

Now, Jackson's speed is 1350 meters per hour. This can be converted to cm per minute as follows:

\frac{1350 m}{1 h}=\frac{1350\times 100 cm}{60 min}=2250 cm/min...Equation 1

Likewise, Jonah's swim speed in cm/min can be calculated as:

\frac{1250 mm}{1 s}=\frac{1250\times 0.1 cm}{\frac{1}{60}min } =\frac{125\times 60 cm}{1 min}=7500cm/min...Equation 2

As we can see clearly after comparing Equation 1 and Equation 2, Jonah's swim speed of 7500 cm/min is faster than that of Jackson.

Thus, option B is correct.

7 0
3 years ago
I need to know everything because I’m dumb.
nadya68 [22]
Hey there!

abx - 5 = 0 abx = 5  x = 5/(ab) 

P.S- Don't call yourself dumb, you just have to learn and you'll know it!

Hope this helps!
6 0
3 years ago
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