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3 years ago

PLEASE I NEED HELP..

Mathematics

2 answers:

marishachu [46]3 years ago

5 0

Answer:

Step 3 is only wrong

This is because the symbol changes when writing in a equation

Hope this is correct and helpful

HAVE A GOOD DAY!

Lerok [7]3 years ago

3 0

Answer:

well i see problems with everything she did from step two on but thats not a choice

Step-by-step explanation:

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A rectangle has a perimeter of 78 inches. Its length is 6 inches more than twice its width.

Ratling [72]

Answer:

Step-by-step explanation:

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3 years ago

How can I solve this ?

LuckyWell [14K]

Answer:

985.25

Step-by-step explanation:

An easy way to divide by larger numbers is to see if the divisor fits into the thousands, hundreds, tens, and ones place.

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3 years ago

Read 2 more answers

What are the factors to the equation 4x2-52x + 169 121? A 4(x-1)(x+12) B 4(x + 1)(x - 12) C. 4(x + 1)(x+12) D. 4(x-1)(x - 12)

Bingel [31]

The given equation is,

$4x^2-52x+169=121$

Simplifying the above equation,

$\begin{gathered} 4x^2-52x+169-121=0 \\ 4x^2-52x+48=0 \end{gathered}$ $\begin{gathered} 4x^2-13\times4x+4\times12=0 \\ 4(x^2-13x+12)=0 \\ 4(x^2-12x-1x+12\times1)=0 \\ 4(x(x-12)-1(x-12))=0 \\ 4(x-12)(x-1)=0 \end{gathered}$

Therefore, the factors of the given expression is 4(x-1)(x-12).

5 0

1 year ago

The height of a cone is two times its base diameter. What is the volume of the cone in terms of its base radius r?

grigory [225]

Answer:

$\frac{4}{3} \pi r^3$ .

Step-by-step explanation:

Let's say that the radius is r. The base diameter is two times the radius, or 2r.

Since the height is two times the diameter, the height is 2 * 2r = 4r.

The volume of a cone is 1/3 * h * pi * r^2. So, the volume of the cone is 1/3 * 4r * pi * r^2 = 1/3 * pi * 4r^3 = 4/3 * pi * r^3.

So, the volume of the cone is $\frac{4}{3} \pi r^3$ .

Hope this helps!

8 0

3 years ago

John drove to Daytona Beach, Florida, in hours. When he returned, there was less traffic, and the trip took only hours. If John

olga55 [171]

Question: John drove to a distant city in 5 hours.

When he returned, there was less traffic and the trip took only 3 hours.

If John averaged 26 mph faster on the return trip, how fast did he drive each way

Answer:

For the first trip he drove at a speed of 39 mph

For the second trip he drove at a speed of 65 mph

Step-by-step explanation:

Let the distance for both journey be Z because they are equal.

Let the speed for the first journey be X

Let the speed of the second journey be Y

Formula for speed = distance ÷ time

For the first journey the speed X = Z ÷ 5

For the second journey the speed Y = Z ÷ 3

Since John averaged 26 mph faster in the second trip than the first trip due to traffic, it means that the difference in speed between the first & second trip is 26 mph

Difference in speed = (Z÷3) - (Z÷5) = 26

subtracting both results to (5Z-3Z) ÷ 15 = 26

Upon cross multiplication

2Z = 390

Z = 390÷2 = 195 miles

Therefore speed for first journey = 195 ÷ 5 = 39 mph

Speed for second journey = 195 ÷ 3 = 65 mph

To verify, 65 - 39 = 26 mph

8 0

3 years ago