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3 years ago

15

Karina is driving from her house to her cottage. If she drives at 10 kilometers per hour, she will arrive at 6 PM. If she drives

at 15 kilometers per hour, she will arrive at 4 PM. How fast must she drive in order to arrive at 5 PM

1 answer:

aev [14]3 years ago

5 0

Answer:

12.5 kilometers per hour

Step-by-step explanation:

$(10+15)/2=25/2=12.5$

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Joana spent $145 on groceries and after tax the final amount was $156.6. What was the tax rate

777dan777 [17]

Answer:

8%

Step-by-step explanation:

Tax equals the original amount times the tax rate

We can find the tax by taking the amount he paid minus the original amount

tax = 156.6 - 145

tax = 11.6

tax = original amount * tax rate

11.6 = 145 * tax rate

Divide each side by 145

11.6/145 = 145/145 * tax rate

.08 = tax rate

To change this to percent, multiply by 100%

.08*100% = 8%

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3 years ago

What’s the axis of symmetry and the vertex of x^2-4x-32

konstantin123 [22]

<span>x^2 -4x -32
</span>a =1b= -4c= -32
The x,y points of the vertex are usually referred to as Vertex = (h, k)where h = -b / (2 * a)
h = --4 / (2 * 1)h = 4 / 2h = 2
k = ah^2 +bh + ck =1*4 -4*2 -32k = 4 -8 -32k = -36
vertex = (2, -36)axis of symmetry = x position = 2
Source:http://www.1728.org/quadr3.htm

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3 years ago

Describe the relationship between the area of the circle and its circumference the _ is _ times the __ times the cercomfrince 1

vichka [17]

Answer: the radius is 1/2 times the diameter

Step-by-step explanation:

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3 years ago

The Flushing River has a current of 3mph. A motorboat takes as long to go 12 miles downstream as to go 8 miles upstream. What is

Nata [24]

Answer: 1.3

Step-by-step explanation:

12-8 = 4

4/3 = 1.3

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