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Triss [41]
3 years ago
13

Which equation does not represent a function?

Mathematics
1 answer:
Vinvika [58]3 years ago
3 0

Answer:

A function is a line where every x has only one solution y.

The answer is D because x has more than one solution.

Step-by-step explanation:

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The length of a rectangle is 5 inches more than 3 times the width. If the area of the rectangle is 68 square inches, what is the
Paladinen [302]

Answer:

Width=4, and Length=17

Step-by-step explanation:

first you will make a variable for the width which i will say is x

now make it an equation (3x+5) (x) = 68

then solve 3x^2+5x=68

then 3x^2+5x-68=0

then x=4

then you have to substitute so 3(4)+5= 17 and 4

6 0
3 years ago
Petrol costs 99p per litre. How much would 47 litres cost?​
Radda [10]

Step-by-step explanation:

99 \times 47 = 517 \times 9 = 4653

6 0
3 years ago
Which scales are equivalent to 1 inch to 1 foot?
Radda [10]

Answer:

A, B, D, F

Step-by-step explanation:

3 0
3 years ago
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Micah is writing a function that models the height a dolphin reaches when it propels itself from underwater to the surface, leap
stepladder [879]

Answer:

The dolphin will be above the surface of the water for 2 seconds.

Step-by-step explanation:

Solving a quadratic equation:

Given a second order polynomial expressed by the following equation:

ax^{2} + bx + c, a\neq0.

This polynomial has roots x_{1}, x_{2} such that ax^{2} + bx + c = a(x - x_{1})*(x - x_{2}), given by the following formulas:

x_{1} = \frac{-b + \sqrt{\Delta}}{2*a}

x_{2} = \frac{-b - \sqrt{\Delta}}{2*a}

\Delta = b^{2} - 4ac

The height of the dolphin after t seconds is given by:

h(t) = -16t^2 + 96t - 128

According to Micha's model, how long will the dolphin be above the surface of the water?

It stays above the surface of the water between the first and the second root. Initially, it is below water, when the first time for which h(t) = 0 it crosses the surface upwards, and then the second time for which h(t) = 0 it crosses the surface downwards.

We have to find these roots. So

h(t) = -16t^2 + 96t - 128

-16t^2 + 96t - 128 = 0

Multiplying by -16

t^2 - 6t + 8 = 0

\Delta = (-6)^{2} - 4*1*8 = 36 - 32 = 4

t_{1} = \frac{-(-6) + \sqrt{4}}{2} = 4

t_{2} = \frac{-(-6) - \sqrt{4}}{2} = 2

4 - 2 = 2

The dolphin will be above the surface of the water for 2 seconds.

4 0
2 years ago
Ben goes to work by car or by train. Out of 200 days, he went by car on 150 days. Work out the relative frequency that Ben goes
ElenaW [278]

Answer:

3/4 = 0.75

Step-by-step explanation:

150/200 = 3/4

3 0
3 years ago
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