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2 years ago

7

Mathematics

1 answer:

Tcecarenko [31]2 years ago

3 0

5(16) + 5(12) works
5(28) also works

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Which graph represents the system of equations?

damaskus [11]

Answer:

Bottom right graph

Step-by-step explanation:

4 0

3 years ago

Which polynomial has factors of 4x-7 and x+4

zzz [600]

Answer:

f(x) = 4x² + 9x - 28

Step-by-step explanation:

Create the polynomial by multiplying (4x - 7) and (x + 4) together:

f(x) = 4x² + 16x - 7x - 28, or

f(x) = 4x² + 9x - 28

Next time, please share the given answer choices. Thanks.

4 0

3 years ago

Jean runs 8 mi and then rides 11 mi on her bicycle on a biathlon. She rides 9 mph faster than she runs. If the total time for he

Ipatiy [6.2K]

Let Jean's speed while running = x mph

Then Jean's speed while riding will be = x+9 mph

Distance covered by running = 8 miles

Distance covered by riding = 11 miles

Total time taken to complete the race = 1.5 hours

As, $time=\frac{distance}{speed}$

So, time for running= $\frac{8}{x}$

And time for riding= $\frac{11}{x+9}$

Equation becomes:

$\frac{8}{x}+\frac{11}{x+9}=1.5$

Now, multiply every term by 2x(x+9) to clear denominators:

$16(x+9)+22x=3x(x+9)$

Simplifying it we get

$3x^{2}-11x-144=0$

Solve the quadratic equation using formula

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

putting a=3 , b= -11, c= -144

we get (x - 9)(3x + 16) = 0

where x=9 and x= $\frac{-16}{3}$

Neglect the negative answer as speed cannot be negative, so x = 9 mph

Hence, Jean's running speed is 9 mph and riding speed is x+9 = 9+9 = 18 mph

4 0

3 years ago

2.8 -3x =12.1 −6x what's x

Kipish [7]

X= 3.1 is the answer

6 0

3 years ago

Read 2 more answers

People use water to cook, clean, and drink every day. An estimate of 19.4% of the water used each day is for drinking. If a fa

Ronch [10]

Answer:

86.7 gallons

Step-by-step explanation:

I literally went decimal by decimal to find it. So theres no way it's wrong

4 0

3 years ago