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3 years ago

Multiply (4n - 5)(2n + 5)

Mathematics

2 answers:

WINSTONCH [101]3 years ago

6 0

Answer:

-7n

Step-by-step explanation:

4-5= -1

2+5= 7

-1×7= -7

-7+n= -7n

likoan [24]3 years ago

4 0

Answer:

8n^2+10n-25

Step-by-step explanation:

it's probably wrong that's what I got tough xp

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What is 100% of 7344 7344 4622 15,642 3672

mixas84 [53]

Answer:

7344

Step-by-step explanation:

4 0

3 years ago

Read 2 more answers

Can someone help me with this and explain it to me please? :) CHECK ATTACHED

babymother [125]

23. not equivalent because the first row 3x-9y=5 then if you multiplied this equation by 2 it will be 2(3x-9y) = 2(5) so 6x-18y= 10 not 6x-9y=10

24.equivalent because the second row 2y-6x=8 multiplied by 2 is 2(2y-6x)= 2(8) so 4y-12x=16

25. equivalent because the first row 5x+3y=19 multiplied by 2 is 2(5x+3y) = 2(19) SO 10X+6Y=38 and the second row 2x+4y=20 multiplied by 5 is 5(2x+4y)= 5(20) so 10x+20y=100

4 0

3 years ago

What is the growth factor of y=70(2)^x

user100 [1]

Answer:

100% growth rate or it doubles

Step-by-step explanation:

This is of the form

y = ab^x

where a is the initial value and

b is the growth/decay factor

b>1 growth

b<1 decay

Since b>1 it is growth

We determine the growth rate by

b-1

2-1 =1

Multiply by 100%

1*100% = 100 % growth rate

3 0

4 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

3 years ago

What are the coordinates of the point on the directed line segment from (-2, 9)(−2,9) to (-1, -4)(−1,−4) that partitions the seg

skelet666 [1.2K]

Answer:

Therefore the coordinates of the point on the directed line segment from (-2, 9) to (-1, -4) that partitions the segment into a ratio of 2 to 3 is

$P(x,y)=(-\dfrac{8}{5},\dfrac{19}{5})$

Step-by-step explanation:

Given:

Let point P divides Segment AB in the ratio 2 : 3

point A( x₁ , y₁) ≡ ( -2 , 9 )

point B( x₂ , y₂) ≡ ( -1 , -4 )

m : n = 2 : 3

To Find:

P( x, y ) = ?

Solution:

Ia a Point P divides Segment AB internally in the ratio m : n, then the Coordinates of Point P is given by Section Formula as

$x=\dfrac{(mx_{2} +nx_{1}) }{(m+n)}\\ \\and\\\\y=\dfrac{(my_{2} +ny_{1}) }{(m+n)}\\\\$

Substituting the values we get

$x=\dfrac{(2(-1) +3(-2))}{(2+3)}\\ \\and\\\\y=\dfrac{(2(-4) +3(9)) }{(2+3)}\\\\$

$x=\dfrac{-8}{5}\\ \\and\\\\y=\dfrac{19}{5}\\\\$

Therefore the coordinates of the point on the directed line segment from (-2, 9) to (-1, -4) that partitions the segment into a ratio of 2 to 3 is

$P(x,y)=(-\dfrac{8}{5},\dfrac{19}{5})$

7 0

3 years ago