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Mnenie [13.5K]
3 years ago
13

Find the number, if 80% of it is 6.4

Mathematics
1 answer:
Igoryamba3 years ago
8 0
.8 * 6.4= 5.12
80% of 6.4 is 5.12
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5t-shirts and a hat costs £83.00,2 t-shirts and a hat costs £38.00.a)how much does a t-shirt cost?
Sergio039 [100]

Answer:

$9 per t-shirt

Step-by-step explanation:

First you subtract the cost of the hats from the TOTAL cost of the the T-shrits and the hat.

$83.00-$38.00= $45

Now that you just have the shirts WITHOUT the hat, which is why we subtracted the $38.00, we have to devide. You devide 45 by the number of shirts.

45/5=9

$9 per T-shirt.

Hope this helps

7 0
3 years ago
Kevin had to measure the diameter of a hair strand and the diameter of a grain of sand for his science experiment. He found the
scZoUnD [109]
This is the concept of linear scale factors. 
Diameter of hair strand is 0.00006=6×10^-5 inches
Diameter of sand grain is 1.3x10^-3 inches
Thus the the number of times the hair sand grain is bigger than hair strand will be:
linear scale factor=(diameter of sand grain)/(diameter of hair strand)
=(1.3×10^-3)/(6×10^-5)
=21 2/3 times


5 0
3 years ago
A teacher is making a history test composed of the same number of multiple-choice questions as short-answer questions. She estim
olga_2 [115]

Answer:

8 questions each for short answer questions and 8 questions of Multiple Choice Questions type.

A total of 16 questions.

Step-by-step explanation:

Given:

The number of multiple choice questions and number of short answer type questions are same.

Let it be equal to .

Average Time taken to attempt multiple choice question = 2 minutes

Total time taken to attempt multiple choice question = 2 minutes

Average Time taken to attempt short answer type question = 3.5 minutes

Total Time taken to attempt short answer type question = 3.5

Total time for test should be less than 45 minutes.

Therefore, the equation becomes:

Hence, the value of

Therefore, the answer is:

8 questions each for short answer questions and 8 questions of Multiple Choice Questions type.

A total of 16 questions.

3 0
2 years ago
I need answers for 1 , 2, 4​
andreyandreev [35.5K]

Answer:

(3) x ≥ -3

(4) 2.5 gallons

(4) -12x + 36

Step-by-step explanation:

<em>Hey there!</em>

1)

Well its a solid dot meaning it will be equal to.

So we can cross out 1 and 2.

And it's going to the right meaning x is greater than or equal to -3.

(3) x ≥ -3

2)

Well if each milk container has 1 quart then there is 10 quarts.

And there is 4 quarts in a gallon, meaning there is 2.5 gallons of milk.

(4) 2.5 gallons

4)

16 - 4(3x - 5)

16 - 12x + 20

-12x + 36

(4) -12x + 36

<em>Hope this helps :)</em>

3 0
3 years ago
Need help on this question
Alja [10]
He uses 15 gallons. Because 270/6 = 45. Meaning he drives 45 miles per gallon. So 675/45=15. 15 gallons he will need to use to drive 675 miles.
7 0
3 years ago
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