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egoroff_w [7]
3 years ago
8

Which expression could be used to solve this problem?

Mathematics
2 answers:
IRISSAK [1]3 years ago
8 0

Answer:

C. 3 x (20 + 15)

Step-by-step explanation:

You have to add 20 + 15 to get 45 so the 20 + 15 goes in the (). It says how much time he has practiced in 3 days so you have to multiply the things in the () by 3 so the 3 goes out side the ().

8090 [49]3 years ago
7 0

Answer:

C. 3 × (20 + 15)

Step-by-step explanation:

If Ben practices this way <em>every day</em>, then the amount of time should be the same.

20 minutes of song practice, 15 minutes of scale practice.

20+15=35

multiply the 35 minutes per day by three

35 times 3 equals 105

So the answer is C.

3 × (20 + 15)

<em>3(35)=105</em>

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geniusboy [140]

Answer:

A.) the function is increasing on the interval (-∞, 0) and decreasing on interval (0,∞)

Step-by-step explanation:

7 0
3 years ago
Find the perimeter of the triangle .
lawyer [7]

Answer:

P = 9x + 22

Step-by-step explanation:

Perimeter = sum of all sides

P = (3x + 11) + (3x + 11) + (3x)

P = 9x + 22

I hope this helps! God bless

5 0
2 years ago
In the box there are 20 toys, but 5 of them are broken. Randomly one after another 2 toys are taken out. What are the chances th
vitfil [10]

Answer:

A

Step-by-step explanation:

Refer to the picture above.

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4 0
3 years ago
If the endpoints of the diameter of a circle are (6, 3) and (2, 1), what is the standard form equation of the circle?
Anastasy [175]
If the endpoints of a diameter are (6,3) and (2,1) the midpoint is the center of the circle so:

(x,y)=((6+2)/2, (3+1)/2)=(4,2)

Now we need to find the radius....the diameter is:

d^2=(6-2)^2+(3-1)^2

d^2=16+4

d^2=20  since d=2r, r=d/2, and r^2=d^2/4 so

r^2=5

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8 0
3 years ago
What is the measurement of BC to the nearest centimeter?
77julia77 [94]

Answer:

a   8

Step-by-step explanation:

You are given two sides and the included angle. Since you don't have any side and the opposite angle, you must use the law of cosines.

a^2 = b^2 + c^2 - 2bc\cos A

a^2 = 5^2 + 11^2 - 2(5)(11)\cos 39^\circ

a^2 = 25 + 121 - 110\cos 39^\circ

a^2 = 60.51

a = 7.779

Answer: a = 8 cm

7 0
3 years ago
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