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Mashutka [201]
3 years ago
7

Martina needs to memorize words on a vocabulary list for German class. She has memorized 20 of the words, which is four-fifths o

f the list. How many words are on the list?
Mathematics
2 answers:
jarptica [38.1K]3 years ago
8 0

Answer:

25 words

Step-by-step explanation:

use a proportion

20/x=⅘

cross multiply

X×4 and 20×5

4x=100

÷4. ÷4

x=25

25 words

check

20/25=4/5

tresset_1 [31]3 years ago
6 0
Four fifths of 25 is 20 so the answer is 25
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P(t) = 250 * (3.04)^t/1.98,
Alex17521 [72]

Answer:

The concept which best describes the change of the population is the derivative of p(t)=250(3.04)^{\frac{t}{1.98}}.

Step-by-step explanation:

Observe that the function p(t)=250(3.04)^{\frac{t}{1.98}} describes the amount of rabbits at the time t (in years) but  no the rate of change of the population at a given instant. So you have to use the derivative of p(t) to obtain that rate of change at any instant. For example, if we derivate the function p(t)=250(3.04)^{\frac{t}{1.98}} we obtain:

p'(t)=250\cdot \log(\frac{1}{1.98})(3.04)^{\frac{t}{1.98}}

And if we want to find the rate of change at t=5 years we evaluate

p'(5)=250\cdot \log(\frac{1}{1.98})(3.04)^{\frac{5}{1.98}}=2326 rabbits/year

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3 years ago
Based on the survey, what is the probability that a person chosen at random is a diabetic patient or an eye patient
KonstantinChe [14]

First, you must find the total number of people. Add together 32, 54, 78, 112, and 96 to get 372. Next, add the number of diabetic patients with the number of patients with eye problems (54 + 112 = 166).

Your fraction is now 116/372. Simplify this to get your answer, 29/93 or 0.31.

6 0
3 years ago
Share R86,70 in the ratio 2 : 1​
rusak2 [61]

Answer:

2:1

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Step-by-step explanation:

2/2+1=2/3×86,70=5780

1/2+1=1/3×8670=2890

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3 years ago
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soldier1979 [14.2K]

Answer:

7 and 5

Step-by-step explanation:

7+5=12 and 7-5=2

8 0
2 years ago
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Answer:

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Step-by-step explanation:

Since 39 out of 40 marbles are green, the probability of randomly choosing green is 39/40.

However, the probability becomes 100% when you look into the bag and choose a green marble. (Unless you are blind or unable to distinguish blue from green, in which case the probability remains 39/40.)

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