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3 years ago

10

Bricklayers use the formula N = 7LH to estimate the number of bricks N needed to build a wall of height H and length L. What is

the height of a wall that is 30 feet long and that requires 2,310 bricks to build? a. 12 ft c. 11 ft b. 10 ft d. 20 ft

1 answer:

miv72 [106K]3 years ago

8 0

Plug in 30ft for L and 2310 for n so you will get 2310=7(30)(h)... h would equal 11ft

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Pls help urgently extra points and mark brainlist

Andreas93 [3]

Answer:

7

Step-by-step explanation:

9 is not a prime factor and of you divide 210 with 11, it will be a decimal

5 0

3 years ago

Solve 2(4x + 5) > 7x + 20.

choli [55]

2(4x+5)>7x+20 perform indicated multiplication on left side

8x+10>7x+20 subtract 7x from both sides

x+10>20 subtract 10 from both sides

x>10

or in interval notation, x=(10, +oo)

8 0

3 years ago

Please solve this question <br>the answer is 45 degree

malfutka [58]

Answer:

∠ABC= 45°

Step-by-step explanation:

∠ABC= ∠BCD (alt. ∠s, AB//CD)

(2x +15)°= (3x)°

2x +15= 3x

3x-2x= 15 <em>(</em><em>-2x </em><em>on </em><em>both </em><em>sides)</em>

x= 15

Substituting the value of x:

∠ABC

= ∠BCD

= [3(15)]°

= 45°

7 0

2 years ago

The area of the triangle is 24 feet.

Aleksandr-060686 [28]

Does anybody know the answer

4 0

3 years ago

A is a 4x4 matrix and A^2 + 4A - 5I = 0. If det(A+2I)>0, enter det(A+2I)

maw [93]

$\mathbf A^2+4\mathbf A-5\mathbf I=0$
$\implies\mathbf A^2+4\mathbf A+4\mathbf I=(\mathbf A+2\mathbf I)^2=9\mathbf I$
$\implies\det\bigg((\mathbf A+2\mathbf I)^2\bigg)=\det(9\mathbf I)$
$\implies\det(\mathbf A+2\mathbf I)^2=9^4\det\mathbf I$
$\implies\det(\mathbf A+2\mathbf I)=\pm\sqrt{9^4}$
$\implies\det(\mathbf A+2\mathbf I)=9^2=81$

where we take the positive root because we're told that the determinant is positive.

5 0

3 years ago