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sdas [7]
3 years ago
8

If 20% of x is 28, what is 70% of x?

Mathematics
2 answers:
Alona [7]3 years ago
7 0

Answer:

98

Step-by-step explanation:

Of means multiply and is means equals

20% *x = 28

Changing to decimal form

.20 * x = 28

Divide each side by .20

.20x/.20 = 28/.20

x =140

Now we want to find 70% of 140

70% * 140

Changing to decimal form

.70 * 140

=98

viktelen [127]3 years ago
7 0

Answer: 98

Step-by-step explanation: 20% is 1/5 of the number. 28 x 5 = 140. 70% of 140 is 98.

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What is the value of n
Crank

Answer:

The correct answer is option D. 69°

Step-by-step explanation:

Points to remember

1). The sum of angles in a linear pair is 180°

2). In a triangle sum of two angles are equal to the exterior angle of third angle

From the figure we can see a triangle in which two exterior angles area given.

<u>To find the value of n</u>

from figure we get,

n = (interior angle of 131°  + interior angle of 160°)

interior angle of 131° = 180 - 131 = 49°

interior angle of 160° = 180 - 160 = 20°

n =  49° + 20° =  69°

Therefore the  correct answer is option D. 69°

7 0
3 years ago
Read 2 more answers
A sample of bacteria is decaying according to a half-life model. If the sample begins with 700 bacteria, and after 10 minutes th
Papessa [141]

Answer:

18 minutes

Step-by-step explanation:

A = A₀ (½)^(t / T)

where A is the final amount,

A₀ is the initial amount,

t is the time,

and T is the half life.

A = 140 when t = 10.  Solve for the half life:

140 = 700 (½)^(10 / T)

0.2 = ½^(10 / T)

log 0.2 = (10 / T) log 0.5

10 / T = 2.32

T = 4.31

When A = 40, t is:

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log 0.057 = (t / 4.31) log 0.5

t / 4.31 = 4.13

t = 17.8

Rounded to the nearest whole number, it takes 18 minutes.

4 0
3 years ago
Find the volume of a pyramid with a square base, where the side length of the base is
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Answer:

2896.34 cubi centimetres

Step-by-step explanation:

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3 years ago
ike tossed a coin several times and recorded the number of heads and tails in the following table: Coin Experiment Side of Coin
UkoKoshka [18]

The correct answer is 0.48 because as you can tell the probability of it landing on heads is just a little bit below the probability of getting tails. Hope I helped!

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2 years ago
Combine like terms to create an equivalent expression. -3.6-1.9t+1.2+5.1t−3.6−1.9t+1.2+5.1t
Andreyy89

Question

Combine like terms to create an equivalent expression.

-3.6-1.9t+1.2+5.1t

Answer:

3.2t - 2.4

Step-by-step explanation:

Given;

-3.6 - 1.9t + 1.2 + 5.1t

Combining like terms means bringing terms that have "t" together and separately, those that don't have "t" together. i.e

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=> 3.2t - 2.4

Therefore, the equivalent expression is;

3.2t - 2.4

4 0
3 years ago
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