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3 years ago

9

Suzanna lays the books end to end and finds that the board is the same length as 21 books. How many centimeters long is the boar

d?
pls use step by step ty

1 answer:

Sveta_85 [38]3 years ago

4 0

Answer:

Step-by-step explanation:

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HELP NEEDED IMMEDIATELY! I'M GETTING DESPERATE!

TiliK225 [7]

Answer:

The number of different possible values are {-7,-6,-5,-4,-3,-2,-1,0,1,2,3,4,5,6,7}.

Step-by-step explanation:

Given : For an integer n, the inequality $x^2 + nx + 15 < 0$ has no real solutions in x.

To find : The number of different possible values of n ?

Solution :

The given inequality is $x^2 + nx + 15 < 0$ have no solution then the discriminant must be less than zero.

i.e. $b^2-4ac$

Here, a=1, b=n and c=15

${n}^{2} - 4 \times 1 \times 15 \: < \: 0$

${n}^{2} - 60 \: < \: 0$

$n^2$

$n$

$n$

i.e. $- 7.75 \: < \: n \: < \: 7.75$

The integer values are {-7,-6,-5,-4,-3,-2,-1,0,1,2,3,4,5,6,7}.

7 0

3 years ago

4)_Slope = 4; contains (-5, - 13)<br> I need help please

castortr0y [4]

Answer:

The equation of the line with slope = 4 and point (-5, -13)

will be:

$y=4x+7$

Step-by-step explanation:

Given

slope = m = 4

point = (-5, -13)

As the point-slope form of the equation of line is

$y-y_1=m\left(x-x_1\right)$

where m is the slope.

substituting the values m = 4 and the point (-5, -13)

$y-y_1=m\left(x-x_1\right)$

$y-\left(-13\right)=4\left(x-\left(-5\right)\right)$

$y+13=4\left(x+5\right)$

subtract 13 from both sides

$y+13-13=4\left(x+5\right)-13$

$y=4x+7$

Therefore, the equation of the line with slope = 4 and point (-5, -13)

will be:

$y=4x+7$

7 0

3 years ago

Help please with an explanation ಥ‿ಥ

morpeh [17]

If BD = 12x + 36
And BD = BC +CD = 3 + 1 = 4
BC = (12x + 36)/4 x 3
= 12(x+ 3) /4 x3
= 3(x+3) x 3
= 9x + 27
Likewise,
FE = 12(x + 3) /3 x 1
= 4x + 12

Area = 1/2 x (BC + FE) x DE
= 1/2 x (9x + 27 + 4x + 12)x (x+1)
= 1/2 x (13x + 39) x (x +1)
= 1/2 x 13x2 + 52x + 39

Hope this helps,
Regards,
ArmyCee:)

6 0

3 years ago

Which range best describes the possible number of cells in one organism , from the very smallest organism to the very largest ?

siniylev [52]

Answer:

ant to a wale

Step-by-step explanation:

4 0

3 years ago

PLEASE HELP ASAP. Which graph represents this system of inequalities? y < or equal to 2x +3 3x + y < or equal to -2

strojnjashka [21]

Y<=2x+3
y=2x+3
x=0→y=2(0)+3=0+3→y=3→Point=(x,y)=(0,3)
y=0→0=2x+3→2x+3=0→2x+3-3=0-3→2x=-3→2x/2=-3/2→x=-1.5→
Point=(x,y)=(-1.5,0)
y<=2x+3 is the region below the right line passes trough the points (0,3) and (-1.5,0)

3x+y<=-2
3x+y-3x<=-2-3x
y<=-3x-2
y=-3x-2
x=0→y=-3(0)-2=0-2→y=-2→Point=(x,y)=(0,-2)
y=0→0=-3x-2→-3x-2=0→-3x-2+2=0+2→-3x=2→-3x/(-3)=2/(-3)→x=-2/3→
x=-0.67→Point=(x,y)=(-0.67,0)
y<=-3x-2 is the region below the right line passes trough the points (0,-2) and (-0.67,0)

Answer: First graph

5 0

3 years ago