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bulgar [2K]
3 years ago
7

Gracie found 35 pinecones. Four sevenths of the pinecones still had seeds. How many of the pinecones still had seeds? Illustrate

the problem
Mathematics
1 answer:
QveST [7]3 years ago
4 0

Answer:

Split the 35 pinecones in 7 groups of 5.

Circle 4 out of the 7 groups.

0 0 0 0 0 5

0 0 0 0 0 10

0 0 0 0 0 15

0 0 0 0 0 20

0 0 0 0 0 25

0 0 0 0 0 30

0 0 0 0 0 35

Step-by-step explanation:

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A bookshelf contains 10 mysteries, 8 biographies, and 6 science fiction books. A book is randomly selected, replaced, then anoth
Pachacha [2.7K]

Answer:

Biography= 8/24= 1/3

Science Fiction= 6/24= 1/4

Step-by-step explanation:

The probability for biography is (biography/total amount of books.)

8/24= 1/3

The probability for science fiction is (science fiction/ total amount of books.)

6/24= 1/4

6 0
3 years ago
At 7:00 A.M., Alicia pours a cup of tea whose temperature is 200°F. The tea starts to cool to room temperature (72°F). At 7:02 A
alexgriva [62]

Answer: A) Option B

B) 22.3 minutes.

Step-by-step explanation:

The temperature decreases in an exponential decrease, this means that we can write the equation as:

T(x) = A*r^x + B

Where A is the difference between the initial temperature and the room temperature, B is the room temperature, and r is a positive number smaller than 1, that says "how fast" the temperature decreases (and x is the variable, in units of time)

We know that the initial temperature

A = 200° - 72° = 128°

B = 72°

T(x) = 128°r^x + 72°

The only option with those two values is option B.

T(x) =  128(0.989)^x + 72

We should check that when x = 2m, the temperature must be 197°

T(2m) = 128*(0.989)^2 + 72 = 197.2° (that we can round down to 197°)

So this equation is correct

Now we want to find the time such the temperature is 172°F

then:

172° = 128°(0.989)^x + 72°

100° = 128°(0.989)^x

100/128 = (0.989)^x

x = ln(100/128)/ln(0.989) = 22.3 minutes.

Let's check in our equation:

T(22.3) =  128°(0.989)^22.3 + 72 = 172°

8 0
3 years ago
Find the value of sin 0<br>cos(90°- 0) + cos 0 sin(90°-0)​
Step2247 [10]

Step-by-step explanation:

sin \theta \: cos(90 \degree - \theta) + cos \theta \: sin(90 \degree - \theta) \\  = sin(\theta + 90 \degree - \theta) \\  = sin(90 \degree)  \\  = 1

5 0
3 years ago
3. The shutter speed ,S, of a camera varies inversely as the square of the aperture setting,f,. When f=8, S=125..
AlekseyPX
A) S = 2410
b) S = 2410÷4= 602.5
I hope you know
6 0
3 years ago
The students who went to summer camp voted for there favorite activities how many more students voted Viking than for fishing 21
Trava [24]
Simply subtract 21 from 9.

Your answer is 12 :)
5 0
3 years ago
Read 2 more answers
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