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3 years ago

A boat travels for 4 hours at a constant speed of 30 km/h.

Mathematics

1 answer:

WINSTONCH [101]3 years ago

6 0

Answer:the boat travel of a constant speed of 120km

Step-by-step explanation:

4x30=120

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9 rose bushes have been planted

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3 years ago

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3 years ago

Grace has a 15 inch diameter bicycle tire. How many revolutions will it make traveling 500 feet?

Brums [2.3K]

Answer:

Revolution = 127.24 revolutions

Step-by-step explanation:

Circumference of the tire = πD

Where D = 15 inch

So,

C = 15π = 47.1 inch

In feets:

47.1 inch = 3.93 feet.

So, one revolution = 3.93 feet

Travelling 500 feet will make the following revolutions:

Revolution = 500 feet/3.93 feet

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3 years ago

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lukranit [14]

The answer is .1391
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3 years ago

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What is the zero in the quadratic function f(x)= 9x^2-54x-19?

Alex17521 [72]

Answer:

6.33... and 0.333...

Step-by-step explanation:

The quadratic formula is

$x=\frac{-b+\sqrt{b^2-4ac} }{2a}$ .

It is important because while some quadratics are factorable and can be solved not all are. The formula will solve all quadratic equations and can also give both real and imaginary solutions. Using the formula will require less work than finding the factors if factorable. We will substitute a=9, b=-54 and c=-19.

$x=\frac{-b+/-\sqrt{b^2-4ac} }{2a}\\x=\frac{-(-54)+/-\sqrt{(-54)^2-4(9)(-19)} }{2(9)}\\x=\frac{54+/-\sqrt{2916+684} }{18}$

We will now solve for the plus and the minus.

The plus,,,

$x=\frac{54+\sqrt{3600}}{18}\\x=\frac{54+60}{18}\\x=\frac{114}{18}\\x=6.3$

and the minus...

$x=\frac{54-\sqrt{3600}}{18}\\x=\frac{54-60}{18}\\x=\frac{-6}{18}\\x=-0.333...$

8 0

3 years ago