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4 years ago

A. 48+1.2m>40 B. 40+1.2m<48 C. 48+1.2m<40 D. 40+1.2m>48

Mathematics

2 answers:

egoroff_w [7]4 years ago

8 0

B is your answer because 40+1.2m is less than 48.

spin [16.1K]4 years ago

4 0

I think the answer is d

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Is 4:5 (4/5) less, or greater than 19:30 (19/30)?

liberstina [14]

4/5 is greater because when you times it by 6 the numerator becomes 24 therefore it is greater

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4 years ago

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|x^2+x-1|=1 solve for x

Marizza181 [45]

x=−3x=-3

Here the steps

2x+1−1x−1=2xx2−12x+1-1x-1=2xx2-1

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(x+1)(x−1)x+1x-1

x−3=2xx-3=2x

x=−3x=-3

So the answer comes out to be x = 3 I hope this was helpful

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4 years ago

The mean length of time, per week, that students at a certain school spend on their homework is 24.3 hours, with a standard devi

bixtya [17]

Answer:

21.1%

Step-by-step explanation:

(25 - 24.3) / 1.2 = 0.5833 z score = 78.9%

You need the percent that spend more than 25 hrs per week, so 100 - 78.9 = 21.1%

4 0

3 years ago

The set M represents multiples of 4 from 6 to 38. M=8,12,16,20,24,28,32,36 The set N represents even numbers from 4 to 13. N=4,6

Tomtit [17]

Answer:

The correct option is B. 2

So there are two elements that is 8, 12 in the set M⋂N .

Step-by-step explanation:

Given:

M is a set of multiples of 4 from 6 to 38

i.e M = { 8, 12, 16, 20, 24, 28, 32,36 }

N is a set of even numbers from 4 to 13

i.e N = { 4, 6, 8, 10, 12 }

To Find:

M⋂N = ?

Solution:

Set:

A set is a well-defined collection of distinct objects, considered as an object in its own right.

Examples :

M is a set of multiples of 4 from 6 to 38

i.e M = { 8, 12, 16, 20, 24, 28, 32,36 }

N is a set of even numbers from 4 to 13

i.e N = { 4, 6, 8, 10, 12 }

M⋂N = set of those numbers which are present in M as well as in N

∴ M⋂N = { 8, 12 }

So there are two elements that is 8, 12 in the set M⋂N .

8 0

3 years ago

First 100 units = 24p per unit Remaining units = 16p per unit Mrs. Watt checks her electricity bill. Here are her meter readings

Talja [164]

Answer: a) 146 units used b) the cost of the number of units used is 3136 p.

Step-by-step explanation:

Since we have given that

First 100 units = 24 p per unit

Remaining units = 16 p per unit

New reading = 7143 units

Old reading = 6997 units

Difference between the readings would be

$7143-6997\\\\=146$

So, there are 146 units used.

(B) Calculate the cost of the number of units used

There are 146 units

For the first 100 units = 24 p per unit

For the remaining i.e. 146-1400 = 46 units , cost = 16 p per unit

Total cost of the number of units used is given by

$24\times 100+46\times 16\\\\=2400+736\\\\=3136\ p$

Hence, a) 146 units used b) the cost of the number of units used is 3136 p.

7 0

3 years ago