14feet 23feet round each measurement to the nearest ten
2 answers:
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Answer:
0.01863, yes preference
Step-by-step explanation:
given that a class consists of 12 boys and 12 girls. The teacher picks five students to present their work to the rest of the class and says that the five students are being selected at random
Here selecting any 5 students from the group of total 24 students is combination because order does not matter.
Total no of ways of selecting any 5 from total 24 =
No of ways of selecting only 5 girls = No of ways of selecting random 5 girls from total 12 girls
=
a) the probability be that all five students
selected are girls=
b) Since the probability for selecting all girls is very small and near to 0, it is unusual to select all girls if done at random. Hence the teacher had a preference for girls.
Answer:
No,
12.8 = 12.800
Obviously, 12.800 <u>< </u>12.815.
#2. First, we factor each polynomial. Then, if any terms on both the top and the bottom of the fraction match, they cancel out. So... we do just that. You end up with:
Notice there's an (x-4) on both top and bottom. So they cancel out. That leaves us with your answer of
#3. We do the same thing as above then multiply and simplify. In the interest of space, I'll cut straight to some simplification.
Now we start cancelling. For the first fraction, there are 3 (x+2)'s on top and 1 on the bottom so we will cancel out the one on the bottom and leave 2 (x+2)'s on top. There are no more polynomials to cancel out so now we multiply across:
10 and 6 share a GCF of 2 so we divide both of those by 2. This leaves us with the final answer of:
#4. This equation introduces division and because of it, we must flip the second fraction to make the division sign into a multiplication symbol. Again for space, I'll flip the fraction and simplify in one step.
Now we do our cancelling. First fraction has (x - 2) in the top and bottom. They're gone. The first fraction has a (x + 4) on the bottom and the second fraction has one on the top. Those will also cancel. This leaves you with:
3 and 6 share a GCF of 3 so we divide both numbers by this. This leaves you with your final answer:
#5. We are adding so we first factor both fractions and see what we need to multiply by to make the denominators the same. I'll do the former first. (10 - x) and (x - 10) are not the same so we multiply the first equation (top and bottom) by (x - 10) and the second equation by (10 - x). Because they will now have the same denominator we can combine them already. This gives us:
Now we FOIL each to expand and then simplify by combining like terms. Again for space, I'm just showing the result of this; you end up with:
Now we factor the top. This gives you 2 (x - 10)'s on top and one on bottom. So we just leave one on the top and cancel the bottom one out. This leaves you with your answer:
#6. Same process for this one so I won't repeat. I'll just show the work.
becomes
which equals
giving you the final answer
#7. For this question we find the least common denominator to make the denominators match. For 5, x, and 2x, the LCD is 10x. So we multiply top and bottom of each fraction by what would make the bottom equal 10x. This rewrites the fraction as:
Simplify to get:
After simplifying again, you end up with your final answer:
Notice there's an (x-4) on both top and bottom. So they cancel out. That leaves us with your answer of
#3. We do the same thing as above then multiply and simplify. In the interest of space, I'll cut straight to some simplification.
Now we start cancelling. For the first fraction, there are 3 (x+2)'s on top and 1 on the bottom so we will cancel out the one on the bottom and leave 2 (x+2)'s on top. There are no more polynomials to cancel out so now we multiply across:
10 and 6 share a GCF of 2 so we divide both of those by 2. This leaves us with the final answer of:
#4. This equation introduces division and because of it, we must flip the second fraction to make the division sign into a multiplication symbol. Again for space, I'll flip the fraction and simplify in one step.
Now we do our cancelling. First fraction has (x - 2) in the top and bottom. They're gone. The first fraction has a (x + 4) on the bottom and the second fraction has one on the top. Those will also cancel. This leaves you with:
3 and 6 share a GCF of 3 so we divide both numbers by this. This leaves you with your final answer:
#5. We are adding so we first factor both fractions and see what we need to multiply by to make the denominators the same. I'll do the former first. (10 - x) and (x - 10) are not the same so we multiply the first equation (top and bottom) by (x - 10) and the second equation by (10 - x). Because they will now have the same denominator we can combine them already. This gives us:
Now we FOIL each to expand and then simplify by combining like terms. Again for space, I'm just showing the result of this; you end up with:
Now we factor the top. This gives you 2 (x - 10)'s on top and one on bottom. So we just leave one on the top and cancel the bottom one out. This leaves you with your answer:
#6. Same process for this one so I won't repeat. I'll just show the work.
#7. For this question we find the least common denominator to make the denominators match. For 5, x, and 2x, the LCD is 10x. So we multiply top and bottom of each fraction by what would make the bottom equal 10x. This rewrites the fraction as:
Simplify to get:
After simplifying again, you end up with your final answer: