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Deffense [45]
3 years ago
13

Help me answer and explain STEP BY STEP for #10 and #11

Mathematics
2 answers:
Reptile [31]3 years ago
4 0

these questions don't need steps

madam [21]3 years ago
4 0

Answer:

10. C, Quadratic trinomial

11. D, (6d - 1) (2d + 1)

Step-by-step explanation:

10. 7x² - 5x + 9 is a quadratic trinomial as there are 3 terms in the expression (trinomial)

11. to factor 12d² + 4d - 1 we can use the quadratic formula, factoring, or completing the square. when the first term is not equal to 1, it may be easier to use the quadratic formula or factoring by grouping. in this example, i will use factoring by grouping which is another way to factor. I will write the middle term (4d) as a subtraction using 2 numbers that when multiplied together give us 12. these 2 numbers are 6 and 2, as 6 x 2 = 12 and 6 - 2= 4

we have the following:

12d² + 6d - 2d - 1 < group 2 factors together

(12d² + 6d) (-2d - 1) < solve for each factor by factoring

to factor 12d² + 6d, we need to find a common factor between the 2 numbers. both have the number 6 in common and the letter d, so we can factor out 6d from the expression

6d(2d + 1)

now we will factor (-2d - 1). we want to get 2d + 1 as a result of the factorization we do, so we need to find a number that gives us that. both -2d and -1 have a -1 in common, so we can factor out a -1 from the expression

-1(2d + 1)

we now have the following:

6d(2d + 1) - 1(2d + 1) < since we have 2 (2d + 1), we only need to write one. we can combine 6d and -1 into one factor

(6d - 1) (2d + 1) is our answer. the answer choice would be D

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Polygon ABCD is plotted on a coordinate plane and then rotated 90° clockwise about point C to form polygon A′B′C′D′. Match each
horrorfan [7]

The vertices of ABCD after 90 degrees clockwise rotation about point C are: A' (0,6), B' (3,7), C' (4,6) and D' (4,3)

<h3>How to match the vertices of the polygon?</h3>

The image of the polygon ABCD is not given; however, the question can still be answered because the coordinates are known.

The vertices of polygon ABCD are given as:

A = (4, 6)

B = (5, 3)

C = (4, 2)

D = (1, 2)

The rule of rotation about point C is:

(x,y) = (a + b - y, x + b - a)

Where:

(a, b) = (4, 2) --- the point of rotation.

So, we have:

(x,y) = (4 + 2 - y, x + 4 - 2)

(x,y) = (6 - y, x + 2)

The above means that:

A' = (6 - 6, 4 + 2) = (0,6)

B' = (6 - 3, 5 + 2) = (3,7)

C' = (6 - 2, 4 + 2) = (4,6)

D' = (6 - 2, 1 + 2) = (4,3)

Hence, the image of the rotation and their vertices (i.e. coordinates) are:

A' = (0,6)

B' =  (3,7)

C' = (4,6)

D' =  (4,3)

Read more about rotation at:

brainly.com/question/4289712

#SPJ1

8 0
2 years ago
Please help???????????
vagabundo [1.1K]

Answer:

x - \sqrt{7}

Step-by-step explanation:

A polynomial has the form

first term is the term of highest degree followed by term of second etc.

note that x = x^{1} ← degree 1

x - \sqrt{7}

fits this description and is a polynomial of degree 1



5 0
3 years ago
An object is translated by ( x + 4, y - 2). If one point in the image has the coordinates (5, -3), what would be the coordinates
Nikolay [14]
To find the pre-image we work backwards. Since the coordinates one of the translated image is (5,-3) and this image was translated with the formula (x+4, y-2), then we can just work backwords. 
(x-4, y+2) --> (5-4,-3+2) -->(1,-1)
The correct answer is (1,-1)
5 0
3 years ago
Hank and his two friends are attending a concert. They purchase tickets and parking for a total of 129.00 they decide to split i
Irina-Kira [14]

Answer:

$43.00

Step-by-step explanation:

$129.00 / 3=$43.00

3 0
3 years ago
Which expressions are equivalent to <br> 2r+(t+r)
stepan [7]

Answer:

2r+(t+r)

2r+t+1r

3r+t

8 0
3 years ago
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