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3 years ago

Which shows the correct substitution of the values a,b,and c from the equation 0=4x^2+2x-1 into the quadratic formula be

1 answer:

6 0

It should be 4x^2 (x square) +2x-1
a=4x^2, b=2x, c=-1
Use the quadratic formula to solve it which is x=-b+- square root b^2-4ac/2a

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An aquarium tank can hold 7200 liters of water. there are two pipes that can be used to fill the tank. the first pipe alone can

Arada [10]

The first pipe pumps out

$\dfrac{7200\text{ L}}{48\text{ min}}=\dfrac{150\text{ L}}{1\text{ min}}$

while the second pipe pumps out

$\dfrac{7200\text{ L}}{96\text{ min}}=\dfrac{75\text{ L}}{1\text{ min}}$

So together, both pipes pump out

$\dfrac{150+75\text{ L}}{1\text{ min}}=\dfrac{225\text{ L}}{1\text{ min}}=\dfrac{7200\text{ L}}{32\text{ min}}$

That is, with both pipes filling the tank, it should take 32 minutes total.

4 0

3 years ago

. Find f(3) for the following function

Snowcat [4.5K]

Answer:

$\boxed {\boxed {\sf D. \ f(3)= 30}}$

Step-by-step explanation:

We are given the function:

$f(x)= 3(2)^x+6$

We want to find f(3), so we must substitute 3 in for x.

$f(3)= 3(2)^3+6$

Solve according to PEMDAS: Parentheses, Exponents, Multiplication, Division, Addition, and Subtraction.

Solve the exponent first.

2³= 2*2*2= 4*2= 8

$f(3)= 3(8)+6$

Multiply 8 and 3.

$f(3)= 24+6$

Add.

$f(3)=30$

For the function given, f(3) is 30.

7 0

2 years ago

Read 2 more answers

Plz help fast hurry

Vesna [10]

You are asking this in the math section. It might be hard to find the answer that way.

3 0

3 years ago

I need help with this ASAP

Monica [59]

Answer:

Step-by-step explanation:

Since there are two arcs and they both make up a circle, and a circle has 360 degrees.

NPL+NL=360

The measure of NPL is twice the measure of NL so

it now

2NL=NPL

Substitute that in the equation

2NL+NL=360

3NL=360

NL=120

Since NL subtends NML they are equal so NML=120

4 0

2 years ago

Keiko, Dale, and Tony sent a total of 95 text messages during the weekend. Dale sent 7 fewer messages than Kelko. Tony sent 4 ti

mylen [45]

Answer:

Keiko sent 17 messages, Dale sent 10 messages, and Tony sent 68 messages

Step-by-step explanation:

Let x represent the number of messages that Keiko sent.

Since Dale sent 7 less than Keiko, his number can be represented by x - 7

Since Tony sent 4 times as many as Keiko, his number can be represented by 4x

Using these variables, create an equation:

(x) + (x - 7) + (4x) = 95

Add like terms and solve for x:

6x - 7 = 95

6x = 102

x = 17

So, Keiko sent 17 messages.

Subtract 7 from this to find how many Dale sent:

17 - 7

= 10

Multiply it by 4 to find how many Tony sent:

17(4)

= 68

So, Keiko sent 17 messages, Dale sent 10 messages, and Tony sent 68 messages

4 0

3 years ago