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svetoff [14.1K]
3 years ago
6

Which expression could be used to solve this problem? Bart practices piano every day. First he practices songs for 20 minutes. T

hen he practices scales for 15 minutes. How much time does Bart practice piano in 3 days? A. 3 × (20 – 15) B. 20 × (15 + 3) C. 3 × (20 + 15) D. 20 × (15 – 3)
Mathematics
1 answer:
Snezhnost [94]3 years ago
5 0
The answer would be C since he practices for a total of 35 or 20+15 minutes for 3 days
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Equation of the parabola in vertex form that passes through (4,-7) and has a vertex of (1,-6)
Alina [70]

y = -\frac{1}{9}(x - 1)^2 - 6

Step-by-step explanation:

The vertex form of the equation for a parabola is given by

y = a(x - h)^2 + k

where (h, k) are the coordinates of the parabola's vertex. Since the vertex is at (1, -6), we can write the equation as

y = a(x - 1)^2 - 6

Also, since the parabola passes through (4, -7), we can use this to find the value for a:

-7 = a(4 - 1)^2 - 6 \Rightarrow -7 = 9a - 6

or

a = -\frac{1}{9}

Therefore, the equation of the parabola is

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2 years ago
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sashaice [31]
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5 0
3 years ago
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Ray is buying some ginger roots to brew some fresh ginger ale. The price of the ginger root is g, and Ray has a coupon for 10% o
kondaur [170]

Step-by-step explanation:

Comparision: Let say you buy chocolate that cost $1. And there was luckily a coupon, for 10% off.

That means after applying the coupon, you will only pay 90% of the original price. Which is

0.9(1) = 0.9

which equals 90 cents.

So let go back to this problem and apply similar thinking.

The price of the original root is g, so for the original price column, check the 3rd cell, g.

Use our comparision problem, by applying the coupon to the chocolate, you will save

1 - 0.9 = 0.1

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In this equation, we can represent this as 0.1g.

So for the second column, shade in 5th cell, 0.1g.

The price would be

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So our equation for this equation will be

0.9g.

So for third column, shade in 1st cell, 0.9g.

7 0
2 years ago
Please help me I tried to do it
anyanavicka [17]
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8 0
3 years ago
Consider the diagram. What is the length of segment AB?
Sloan [31]
B. 9 I think because it looks like it is bisected in the middle to cut into two equal parts. Please correct me if I am wrong. Thanks. 
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3 years ago
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