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NikAS [45]
3 years ago
9

Substitution:(x=2y) (y=x-2)

Mathematics
1 answer:
GaryK [48]3 years ago
5 0

Answer:

2=y

4=x

Step-by-step explanation:

x=2y

y=2y-2

add 2 to both sides

2+y=2y

subtract y from both sides

2=1y

2=y

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What is 7 3/8 as a decimal
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On a map, the distance between Greenville and Fairview is 7 1/4 inches. If the map uses a scale of 1/2 inch = 40 miles, what is
lubasha [3.4K]

The actual distance between cities is 580 miles.

Step-by-step explanation:

Map distance = 7\frac{1}{4} inches = \frac{29}{4}\ inches

Scale used;

\frac{1}{2}\ inches = 40\ miles

Multiplying both sides by 2

2*\frac{1}{2}=40*2\\1\ inch = 80\ miles\\

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The actual distance between cities is 580 miles.

Keywords: fraction, multiplication

Learn more about fractions at:

  • brainly.com/question/2367554
  • brainly.com/question/2670657

#LearnwithBrainly

4 0
3 years ago
A typical person has an average heart rate of 70.0 70.0 beats/min. Calculate the given questions. How many beats does she have i
harina [27]

Answer:

a) 2.2 × 10⁸ beats

b) 2.20 × 10⁸ beats

c) 2.207 × 10⁸ beats

Step-by-step explanation:

Data provided in the question:

Average heart rate of a typical person = 70.0 beats/min

Now,

In the given cases, the significance is on the significant figures after the decimal

Therefore,

the answer is will be provided accordingly

Now,

a) Time = 6.0 years

[since 1 significant figure after decimal. answer will be give in  1 significant figure after decimal ]

time in minutes = 6.0 × 365 × 24 × 60

= 3.1 × 10⁶ minutes

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= 70 × 3.1 × 10⁶

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b)  Time = 6.00 years

[since 2 significant figure after decimal. answer will be give in 2 significant figure after decimal ]

time in minutes = 6.00 × 365 × 24 × 60

= 3.15 × 10⁶ minutes

Total beats = Average heart rate × Time

= 70 × 3.15 × 10⁶

= 2.20 × 10⁸ beats

c) Time = 6.000 years

[since 3 significant figure after decimal. answer will be give in 3 significant figure after decimal ]

time in minutes = 6.000 × 365 × 24 × 60

= 3.154 × 10⁶ minutes

Total beats = Average heart rate × Time

= 70 × 3.154 × 10⁶

= 2.207 × 10⁸ beats

8 0
3 years ago
Andre has $ 90 dollars to spend on sneakers. This is 75% of the cost of the sneakers. How much more will the need? Solve and exp
goldenfox [79]

Answer:

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Well if 90 is 75% then 50% should be 60 and 25% should be 30.

so its going up and down by 30, so that would make 100% 120

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7 0
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