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Fiesta28 [93]
4 years ago
15

If 30% of John's photographs were perfect, but 210 photographs were not perfect, then how many photographs were there in all?

Mathematics
1 answer:
anyanavicka [17]4 years ago
3 0
If 30% were perfect, 70% were not perfect.  So we know that 70% of the total number of photographs is 210.

p(70/100)=210  multiply both sides by 100

70p=21000  divide both sides by 70

p=300

So there are 300 photographs in all.
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Answer:

146 in

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Step-by-step explanation:

4ft 9 = 4*12+9=48+9=57

3ft 10 = 3*12+10=36+10=46

3ft 7 = 3*12+7=36+7=43

57+46+43=146

146/12 = 12ft remainder 2

12ft 2in

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Marina86 [1]

Answer:

The probability of selecting a black card or a 6 = 7/13

Step-by-step explanation:

In this question we have given two events. When two events can not occur at the same time,it is known as mutually exclusive event.

According to the question we need to find out the probability of black card or 6. So we can write it as:

P(black card or 6):

The probability of selecting a black card = 26/52

The probability of selecting a 6 = 4/52

And the probability of selecting both = 2/52.

So we will apply the formula of compound probability:

P(black card or 6)=P(black card)+P(6)-P(black card and 6)

Now substitute the values:

P(black card or 6)= 26/52+4/52-2/52

P(black card or 6)=26+4-2/52

P(black card or 6)=30-2/52

P(black card or 6)=28/52

P(black card or 6)=7/13.

Hence the probability of selecting a black card or a 6 = 7/13 ....

7 0
3 years ago
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3 0
3 years ago
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zzz [600]

Answer:

yes

Step-by-step explanation:

To determine if the point is a solution, substitute the coordinates into the left side of the inequality, evaluate and compare with right side.

- 8(3) - 2(2) = - 24 - 4 = - 28 < 6

Thus (3, 2) is a solution

5 0
4 years ago
Read 2 more answers
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