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Romashka [77]
3 years ago
9

The bristles on a Chinese writing brush are 70% rabbit hair and 30% goat hair. What fraction of the bristles is goat hair?

Mathematics
2 answers:
Nataliya [291]3 years ago
5 0
30/100...because it says that it's 30 percent
erastova [34]3 years ago
3 0
The answer is 3/10. ( asked me if you have anymore question)
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Jim walks 2 miles in an hour. It takes him 3 hrs to walk 6 miles.
julia-pushkina [17]

Answer:

in 5 hours he would walk 10 miles. It would take him about 2 hours to walk 4 miles

Step-by-step explanation:

Since he walks 2 miles an hour, you can multiply 5 by 2 in order to get 10 miles. Use this same strategy for the 4 miles except reverse, divide 4 by 2, 2 hours.  

An equation you can use is, Y = ( X ) x 2

5 0
3 years ago
A new antibiotic is effective for 85% of infections. The antibiotic is given to 40 patients. a) Verify that this is a binomial s
Charra [1.4K]
(a)
The binomial distribution can be used because the current situation satisfies all of the following:
1. The probability of success (p=85%) is known and remains constant during the whole experiment
2. The number of trials (n=40) is known and constant.
3. Each trial is a bernoulli trial (success or failure only)
4. All trials are (assumed) independent of each other.
The probability of x successes is therefore
P(X=x)=C(n,x)(p^x)(1-p)^(n-x)

(b) P(X=35) means the probability of 35 successes out of 40 trials at p=0.85
and
P(X=35)=C(40,35)*0.85^35*0.15^5=658008*0.003386*0.00007594
=0.16918

(c) P(X>=35)=∑ P(X=i) for i=35 to 40
=0.16918+0.13315+0.08157+0.03649+0.01060+0.00150
=0.4325

(d) P(X<20)=&sum; P(X=i) for i=0 to 19
=0.00000003513   (individual probabilities are very small).
4 0
3 years ago
Write each fraction as an expression using a negative exponent other than -1: 1/1024​
raketka [301]
Answer: 2^-10
Do you need an explanation?
6 0
3 years ago
Find the equation of the straight line passing through the point (0,1) which is perpendicular to the line y= -2x + 2
mylen [45]

Answer:

y = 1/2x + 1

In order to evaluate a slope that is perpendicular to the given equation, you need to find the opposite reciprocal of the original slope. This means you take the original slope, flip the numerator and the denominator, and change the sign in front.

-2 ⇒ 1/2

Next, we need to substitute the information given into the point-slope formula.

The point-slope formula is:

y - y₁ = m(x - x₁)

y - 1 = 1/2(x - 0)

y - 1 = 1/2x

y = 1/2x + 1

Therefore, the line perpendicular to y = -2x + 2 is y = 1/2x + 1.

6 0
3 years ago
Ginny has 16 chocolate bars. She gives away ¾ of her chocolate bars to friends. How many chocolate bars did Ginny give away?
Phantasy [73]

Answer:

She gave away 12, so she still has 4.

Step-by-step explanation:

16 times .75 equals 12.

6 0
3 years ago
Read 2 more answers
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