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3 years ago

PLS HELP ME I NEED ANSWER FAST

Mathematics

2 answers:

erica [24]3 years ago

6 0

Step-by-step explanation:

(4x^3 - 4 + 7x) - ( 2x^3 - x - 8) = 2x^3 + 8x + 4

= (B)

(-3x^2 + x^4 + x) + (2x^4 - 7 + 4x) = 3x^4 - 3x^2 + 5x - 7

= (D)

(x^2 - 2x)(2x + 3) = 2x^3 - x^2 - 6x

= (A)

vaieri [72.5K]3 years ago

4 0

Answer:

it is a.

Step-by-step explanation:

You might be interested in

Is y=x^3 a solution of the differential equation yy'=x^5+y

shepuryov [24]

No; we have $y=x^3\implies y'=3x^2$ . Substituting these into the DE gives

$3x^5=x^5+x^3$

which reduces to $x^3=0$ , true only for $x=0$ .

3 0

3 years ago

Andrew participated in a bicycle race. The total distance covered was 56

Inessa05 [86]

(B) 4 hr is the correct answer.

<h3>Explanation :</h3>

★ Speed of body is defined as the ratio of distance travelled to the time taken $.$

speed = distance/time

Given that,

distance = 56 miles

speed = 14 miles per hour

By substituting the values, we get

⭆ time = distance/speed

⭆ time = 56/14

⭆ time = 4 hr

<h3>Hope It Helps!</h3>

8 0

3 years ago

a line has a slope of -2 and includes the points (-1,r) and (2,4). write the value of r in the empty box

guajiro [1.7K]

Answer:

r= 10

Step-by-step explanation:

4 0

3 years ago

Segment CD has endpoints at C(0, 3) and D(0, 7). If the segment is dilated by a factor of 3 about point C, what is the length of

Klio2033 [76]

The distance is dilated by a factor of 3, the length of the image of segment CD will be 4(3) which is 12 units

Given the coordinate of the segment CD with endpoints at C(0, 3) and D(0, 7) is expressed as:

$D=\sqrt{(7-3)^2(0-0)^2}\\D=\sqrt{4^2}\\D = 4 units$

If the distance is dilated by a factor of 3, the length of the image of segment CD will be 4(3) which is 12 units

Learn more here: brainly.com/question/22624745

3 0

2 years ago

Researchers conducted an experiment to test the effects of alcohol. Errors were recorded in a test of visual and motor skills fo

Jobisdone [24]

Answer:

H0: σ1=σ2

Ha : σ1 >σ2

B. Upper H 0H0:

sigma Subscript 1 Superscript 2σ21equals=sigma Subscript 2 Superscript 2σ22

Upper H 1H1:

sigma Subscript 1 Superscript 2σ21greater than>sigma Subscript 2 Superscript 2σ22

Step-by-step explanation:

The claim is that the treatment group has errors that vary significantly more than the errors of the placebo group.

The claim is the alternative hypothesis and the opposite of claim is the null hypothesis.

Vary significantly means that it is greater than so we choose the alternate hypothesis of greater than and the null hypothesis will be equal to errors of the placebo group.

So the correct choice is B.

B. Upper H 0H0:

sigma Subscript 1 Superscript 2σ21equals=sigma Subscript 2 Superscript 2σ22

Upper H 1H1:

sigma Subscript 1 Superscript 2σ21greater than>sigma Subscript 2 Superscript 2σ22

Choice A,C and D all are incorrect.

This can be written as

H0: σ1=σ2

Ha : σ1 >σ2

5 0

2 years ago