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iren2701 [21]
3 years ago
12

1) A brick wall has 60 bricks in the bottom row but each row has 3 fewer bricks than the previous one. How

Mathematics
2 answers:
andrew11 [14]3 years ago
8 0

Answer:

24 bricks

Step-by-step explanation:

The equation of the bricks per row can be:

b = 60 - 3r

where r = row and b = bricks.

if r = 12:

b = 60 - 3 * 12\\b = 60 - 36\\b = 24

liubo4ka [24]3 years ago
5 0

There are 27 bricks in the 12th row. Hope this helps ! :)

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Write the point-slope form of the equation of the line that passes through the points (-3, 5) and (-1, 4). Please answer quickly
Oksanka [162]
The point-slope form of the equation of a line is

y - y_1 = m(x - x_1)

where

(x_1, y_1)

is a point on the line, and

m

is the slope of the line.

We can use either one of the two given points as the point on the line.
We also need to find the slope. We can use the coordinates of the two given points to find the slope of the line.

The slope of the line that passes through points

(x_1, y_1) and (x_2, y_2)

is

m = \dfrac{y_2 - y_1}{x_2 - x_1}

Let's find the slope using (-3, 5) as point 1 and (-1, 4) as point 2.

m = \dfrac{4 - 5}{-1 - (-3)} = \dfrac{-1}{-1 + 3} = \dfrac{-1}{2} = -\dfrac{1}{2}

Now we use the point-slope formula with point 1 and the slope we found just above.

y - y_1 = m(x - x_1)

y - 5 = -\dfrac{1}{2}(x - (-3))
4 0
3 years ago
2% of 250 this is worth probaly eleven points plz help me find the percent of the quantity ​
lapo4ka [179]

Answer:

= 5

Step-by-step explanation:

(2/100) × (250/1)

multiply the numerators

500/100

5/1

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7 0
3 years ago
Given x : y: z = 5:1:3 and z - y = 28. find the value of x + y​
Vera_Pavlovna [14]

Answer:

x + y = 84

Step-by-step explanation:

Given

x : y : z = 5 : 1 : 3, then

\frac{x}{y} = 5 ( multiply both sides by y )

x = 5y ←

and \frac{y}{z} = \frac{1}{3} ( cross- multiply )

3y = z

Substitute z = 3y into z - y = 28

3y - y = 28

2y = 28 ( divide both sides by 2 )

y = 14 ← ←

Substitute y = 14 into x = 5y

x = 5 × 14 = 70 ← ←

Substitute y = 14 into z - y = 28

z - 14 = 28 ( add 14 to both sides )

z = 42 ← ←

Thus x = 70, y = 14 and z = 42

Hence x + y = 70 + 14 = 84

5 0
3 years ago
-7 times 8 = 7 times (-8) true or false
12345 [234]

Answer:

Yaa it's true

Step-by-step explanation:

-56=-56

from both side u get the same answer

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