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Zarrin [17]
3 years ago
6

200 elementary school students were surveyed to find their blood groups. Of those, 55 were of blood group A, 85 of blood group B

, and 21 of blood group O. What is the probability that a randomly chosen student has either blood group A or blood group B? A) 0.25 B) 0.60 C) 0.70 D) 0.81
Mathematics
1 answer:
miss Akunina [59]3 years ago
4 0
C)0.70 becasue 140 is 70% of 200
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A company manufactures skateboards. Each skateboard requires 1 6/7 hours of labor to assemble and 2 1/2 hours of labor to finish
Assoli18 [71]

Answer: The total cost will be $156.85.

Step-by-step explanation:

Since we have given that

Time taken by labor to assemble the each skateboard is given by

1\frac{6}{7}\ hours\\\\=\frac{13}{7}\ hours

Time taken by labor to finish and stain each skateboard is given by

2\frac{1}{2}\ hours\\\\=\frac{5}{2}\ hours

Cost of labour to the company per hour = $36.00

According to question,

We will use "Distributive Property":

a\times (b+c)=a\times b+a\times c

36(\frac{13}{7}+\frac{5}{2})\\\\=36\times \frac{13}{7}+36\times \frac{5}{2}\\\\=\frac{468}{7}+18\times 5\\\\=\frac{468}{7}+90\\\\=\frac{468+630}{7}\\\\=\frac{1098}{7}\\\\=\$156.85

Hence, the total cost will be $156.85.

5 0
3 years ago
To what power must you raise the expression 7^1/2 to get 7 as the result?
Anvisha [2.4K]

Answer:

2

Step-by-step explanation:

(7^1/2)^2=7^(1/2*2)=7

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2 years ago
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