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3 years ago

-4.9t²+12^t+1.8 quadratic formula

Mathematics

1 answer:

koban [17]3 years ago

4 0

Answer:

t = 2.59077022, −0.14179062

Step-by-step explanation:

−12±√(12^2)−4)(−4.9)(1.8)/2(−4.9)

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HURRY

algol13

A would be the correct answer.
The numbers 3,4,5 are a Pythagorean Triple. This means they can be put in the form a^2 + b^2 = c^ where a=3, b=4 and c=5.

5 0

3 years ago

Read 2 more answers

Solve the equation 7x+4=32

Vlad [161]

Answer:

x=4

Step-by-step explanation:

32-4=28

28÷7= 4

x=4

5 0

3 years ago

The number of cars at a car dealership is reduced by 10% in the first sales quarter of the year. If the number of cars decreased

Sphinxa [80]

Answer:

B) 28%

=================

Let the initial price be x.

After the first sales quarter the price is reduced by 10% and became:

x - 10% =
x - 0.1x =
0.9x

After the second sales quarter the price is reduced by 20% and became:

0.9x - 20% =
0.9x - 0.2*0.9x =
0.9x - 0.18x =
0.72x

The decrease over the two quarters is:

x - 0.72x =
0.28x

This is equivalent of 28%, hence the <u>correct answer choice</u> is B.

7 0

2 years ago

A fence for a rectangular garden with one side against an existing wall is constructed by using 60 feet of fencing. What is the

Y_Kistochka [10]

Step-by-step explanation:

A fence for a rectangular garden with one side against an existing wall is constructed by using 60 feet of fencing.

Perimeter of rectangle (3 sides)= 60 feet

Let 'x' be the width of the wall

$Perimeter = 2(length)+2(width)\\60=2(length)+2x\\\\60-2x=2(length)\\\frac{60-2x}{2} =length\\Length =30-x$

Formula for the area of the rectangle is

$Area=length \cdot width\\A=length(x)$

Replace the length we got using perimeter

$A=(30-x)(x)\\A(x)= 30x-x^2$

To find out the maximum are we take derivative

$A'(x)= 30-2x\\0=30-2x\\-30=-2x\\x=15$

find out second derivative to check whether x=15 is maximum

$A''(x)=-2$

second derivative is negative

So, Maximum area at x=15

To find maximum area we plug in 15 for x in A(x)

$A(x)=30x-x^2\\A(15)=30(15)-15^2\\A(15)=225$

So, maximum area is 225 square feet

3 0

4 years ago

I NEED help like ASAP PLEASEEEEE

In-s [12.5K]

Answer:

This should be 0,1

Step-by-step explanation:

I can barely see the graph bit it should be 0,1

5 0

3 years ago