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notsponge [240]
3 years ago
11

Help asap

Mathematics
1 answer:
kiruha [24]3 years ago
6 0

Answer: (1) d, f     (2) c, d, f     (3) e, f      (4) a, b, c, d, f     (5) e, f

<u>Step-by-step explanation:</u>

a) Natural Numbers:            1, 2, 3, ...

b) Whole Numbers:          0, 1, 2, 3, ...     <em>(add zero to the Natural numbers)</em>

c) Integers:   ..., -3, -2, -1, 0, 1, 2, 3, ...   <em>(add negatives to the Whole numbers)</em>

d) Rationals: Add terminating and repeating decimals to Integers.

************

e) Irrationals: Non-repeating decimals that are non-terminating.  <em>This is its own category so cannot be a Rational number or above.</em>

f) Real Numbers: ALL of the above (a - e) are Real numbers.

1) -5.2  has a terminating decimal so it is a RATIONAL number.

2) -4  is below zero so is an INTEGER which means it is also a RATIONAL #

3) -4.3212... is a non-terminating decimal so it is an IRRATIONAL number

4) \sqrt4 = 2 is a NATURAL number which means it is also a WHOLE number, INTEGER, and RATIONAL number.

5) \sqrt7  is a non-terminating decimal so it is an IRRATIONAL number

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*REVERSE PROPORTION*
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Answer:

  33.3%

Step-by-step explanation:

The selling price of £42 is (1 +40%) times the total purchase price.

  1.40 × purchase price = £42

  purchase price = £42/1.40 = £30

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The purchase price of the skirt is ...

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2 years ago
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Please help ! This is 7th grade math and I’ve been stuck on this question for 30 minutes!
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\dfrac{1}{22}\:\dfrac{\text{in}}{\text{hr}}

Step-by-step explanation:

The amount of time from 10pm to 7am is 9 hours. However, the time indicated is 7:10am. Since there are 60 minutes in an hour, 10 min is equal to 1/6 of an hour. Therefore, the total time that the water level of the pool decreased is 9\frac{1}{6} hours or \frac{55}{6} hours. To find the rate at which the water level decreased, we divide the change in the water (in inches) by the time it took to reach that level. So we write

rate of change = \dfrac{\text{change\:in\:height}}{\text{change\:in\:time}}

\:\:\:\:\:\:\:= \dfrac{\frac{5}{12}\:\text{in}}{\frac{55}{6}\:\text{hrs}}

\:\:\:\:\:\:\:=\dfrac{5}{12}\cdot\dfrac{6}{55}\:\dfrac{\text{in}}{\text{hr}}

\:\:\:\:\:\:\:= \frac{1}{22}\:\dfrac{\text{in}}{\text{hr}}

7 0
2 years ago
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