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4 years ago

How would I solve (x-3)(3x+5)

1 answer:

3 0

Apply the FOIL method: (a+b)(c+d)=ac+ad+bc+bd

3x^2+5x−9x−15
Simplify

3x^2−4x−15

So,

3x^2−4x−15 is the answer. :)

I hope this helps. :)

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a. Fill in the midpoint of each class in the column provided. b. Enter the midpoints in L1 and the frequencies in L2, and use 1-

Tresset [83]

Answer:

$\begin{array}{ccc}{Midpoint} & {Class} & {Frequency} & {64} & {63-65} & {1} & {67} & {66-68} & {11} & {70} & {69-71} & {8} &{73} & {72-74} & {7} & {76} & {75-77} & {3} & {79} & {78-80} & {1}\ \end{array}$

Using the frequency distribution, I found the mean height to be 70.2903 with a standard deviation of 3.5795

Step-by-step explanation:

Given

See attachment for class

Solving (a): Fill the midpoint of each class.

Midpoint (M) is calculated as:

$M = \frac{1}{2}(Lower + Upper)$

Where

$Lower \to$ Lower class interval

$Upper \to$ Upper class interval

So, we have:

Class 63-65:

$M = \frac{1}{2}(63 + 65) = 64$

Class 66 - 68:

$M = \frac{1}{2}(66 + 68) = 67$

When the computation is completed, the frequency distribution will be:

Solving (b): Mean and standard deviation using 1-VarStats

Using 1-VarStats, the solution is:

$\bar x = 70.2903$

$\sigma = 3.5795$

See attachment for result of 1-VarStats

8 0

3 years ago

4 _ (3 _ 2) _ 6 _ 1 = 14 Please help ill give you brainly!

lubasha [3.4K]

4x(3+2)-6x1= 14 is the answer

6 0

3 years ago

a globe has a diameter of 24 inches. a smaller globe has a diameter of 18 inches. What is the surface are to volume ratio of the

faust18 [17]

Answer:

1 pi: 3pi

Step-by-step explanation:

Step 1: Formula of surface area and volume of sphere

Surface area of sphere = 4 x pi x r^2

Volume of sphere = 4 x pi x r^3

Step 2: Apply values in the formula

r = radius

radius = diameter/2

r=18/2 = 9

S.A = 4 x pi x 9^2

S.A = 324pi

Volume = 4 x pi x 9^3

Volume = 972pi

Step 3 : Show in ratio

Surface area : Volume

324pi : 972pi

= 1 pi: 3pi

6 0

4 years ago

If using the method of completing the square to solve the quadratic equation

jenyasd209 [6]

You add half of the coefficient of x and square it.

What you do on one side,you must do it on the other.

4 0

3 years ago

Can someone help me on this math problem.

nekit [7.7K]

In the rhombus, the diagonals are perpendicular.

We know, the sum of the measures of the triangle is equal 180°.

Therefore we have the equation:

$(2x-15)+3x+90=180$

$2x-15+3x+90=180$ combine like terms

$(2x+3x)+(-15+90)=180$

$5x+75=180$ subtract 75 from both sides

$5x=105$ divide both sides by 5

$\boxed{x=21}$

<h3>Answer: x = 21°</h3>

4 0

3 years ago