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k0ka [10]
3 years ago
9

Danny reads for one half hour every day.

Mathematics
2 answers:
fgiga [73]3 years ago
8 0

There are 7 days in a week.

1/2 hour x 7 days = 3 1/2 hours per week.

3 1/2 hours per week x 4 weeks = 14 hours

He read for a total of 14 hours

spayn [35]3 years ago
6 0

Answer:

14 hours

Step-by-step explanation:

half hour = 30 minutes

1 week = 7 days

30(minutes) x 7(days) = 210 minutes

210(minutes) x 4(weeks) = 840 minutes

Now we know how much time Danny has read (840 minutes), but we need to know what that is in hours.

840 minutes = how long Danny has read in minutes

60 minutes = hour

840(minutes) ÷ 60(minutes) = 14(hours)

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How many "words" can be written using exactly five A's and no more than three B's (and no other letters)?
kakasveta [241]

This is a problem of Permutations. We have 3 cases depending on the number of B's. Since no more than three B's can be used we can use either one, two or three B's at a time.

Case 1: Five A's and One B

Total number of letters = 6

Total number of words possible = \frac{6!}{5!*1!}=6

Case 2: Five A's and Two B's

Total number of letters = 7

Total number of words possible = \frac{7!}{5!*2!}=21

Case 3: Five A's and Three B's

Total number of letters = 8

Total number of words possible = \frac{8!}{5!*3!}=56

Total number of possible words will be the sum of all three cases.

Therefore, the total number of words that can be written using exactly five A's and no more than three B's (and no other letters) are 6 + 21 + 56 = 83

8 0
3 years ago
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Which of the following is the product of the rational expressions shown here? 1/x+2 * x/x-2 A.) x/x^2-4 B.) x+1/x^2-4 C.) x+1/2x
Inessa [10]

Answer:

A

Step-by-step explanation:

\frac{1}{x+2}*\frac{x}{x-2}=\frac{1*x}{(x+2)(x-2)}\\\\\\=\frac{x}{x^{2}-2^{2}}\\\\\\=\frac{x}{x^{2}-4}

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Decrease 600g of dog food in the ratio 7: 12<br><br><br> HELP PLSS !!!!
olganol [36]
Okay well then this gotta be more then 8 points
8 0
2 years ago
I would wanna know how to solve this​
Anastasy [175]

Step-by-step explanation:

Given,

AC=AD and ang CBA = ang BAD

To prove : Triangle ABC is congruent to Triangle ABD

Proof

Statements Reasons

1. In triangle ABC and 1.

Triangle ABD

i) AC = AD (S) i) Given

ii)ang CAB=ang BAD (A) ii) Given

iii) AB = AB (S) iii)common sides

2. Triangle ABC is

Congurent to triangle

ABD

2. From SAS fact

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Please help<br> thanks<br> 10 points
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