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miv72 [106K]
3 years ago
12

A contractor estimated that one of his two brick layers would take 9 hours to build a certain wall and the other 10 hours. Howev

er, he knew from experience that when they worked together, 10 fewer bricks were laid per hour. Since he was in a hurry, he put both men on the job and found it took exactly 5 hours to build the wall. How many bricks did the wall contain?
Mathematics
1 answer:
Dmitry [639]3 years ago
6 0

Answer:

900

Step-by-step explanation:

Assume x brick

X*(1/9+1/10)一 10=X/5

X(19/90-1/5)=10

X*(1/90)=10

X=900

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Pens come in packages of 6. Pencils come in
serious [3.7K]

A. The Least common multiple between 6 and 8 is 24, so you have to buy 4 packages of pens and 3 packages of pencils.

2. Since you bought 24 pens and 24 pencils, you have 48 pens and pencils in all

8 0
3 years ago
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Graph the line that has a slope of −13 and contains the point (3,−7)
yuradex [85]
From the origin you have to go 3 right put a dot and seven down put a dot, 13 down and one right ? Not sure
6 0
3 years ago
A line with a slope of 2 passes through the points (0,4) and (-6,v). What is the value of v?
krok68 [10]

To solve this problem, we should create an equation using the given information.  To do this, we should calculate the slope between the two points as if they were regular points, giving us:

change in y/change in x = (v-4)/(-6-0) = (v-4)/(-6)

Since we know that the slope is 2, we can set our calculated value for the slope of the line for the equation (v-4)/(-6) equal to 2, as shown below:

(v-4)/(-6) = 2

To solve this equation, we should multiply both sides of the equation by -6 to get rid of the denominator on the left side of the equation.

v-4 = -12

Next, we should add 4 to both sides of the equation to get the variable v alone on the left side of the equation, as shown below:

v = -8

Therefore, v =-8 is your answer.

Hope this helps!

4 0
3 years ago
Please help!!!!!!!!!! im struggling
Elenna [48]

Answer:

2

Step-by-step explanation:

If you look at how many lines are lines up at the ten that is the answer

8 0
2 years ago
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Given the function f(x) = 3x + 1, what is the value of f(-2/3)? <br><br>show work <br>​
Marta_Voda [28]

Answer:

f(-2/3) = -1

General Formulas and Concepts:

<u>Pre-Algebra</u>

Order of Operations: BPEMDAS

  1. Brackets
  2. Parenthesis
  3. Exponents
  4. Multiplication
  5. Division
  6. Addition
  7. Subtraction
  • Left to Right

<u>Algebra I</u>

  • Function Notation

Step-by-step explanation:

<u>Step 1: Define</u>

f(x) = 3x + 1

f(-2/3) is x = -2/3

<u>Step 2: Evaluate</u>

  1. Substitute:                    f(-2/3) = 3(-2/3) + 1
  2. Multiply:                        f(-2/3) = -2 + 1
  3. Add:                              f(-2/3) = -1
7 0
3 years ago
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