1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Setler79 [48]
3 years ago
10

Timothy bought concrete mix for several projects. He used

Mathematics
2 answers:
Hunter-Best [27]3 years ago
8 0

Answer:

The required model is 3.5y+2.25y=345

60 pounds of concrete each bag make.

Step-by-step explanation:

Consider the provided information.

Let the number of concrete bags are used is represented by y.

Part (A)

3.5 bags of concrete mix for a new set of stairs and 2.25 bags  of concrete mix for a garden wall.

This can be written as:

3.5y+2.25y

Timothy mixed  345 pounds of concrete in all.

Therefore, 3.5y+2.25y=345

Hence, the required model is 3.5y+2.25y=345

Part (B)  Solve for y. How many pounds of concrete does each bag make?

Consider the above equation.

3.5y+2.25y=345

Solve the equation for y as shown.

Add the like terms.

5.75y=345

Divide both the sides by 5.75

y=60

Hence, 60 pounds of concrete each bag make.

stira [4]3 years ago
4 0
3.5y+2.25y=345

5.75y=345

60

Each bag makes 60 lbs of concrete
You might be interested in
Which equation is equivalent to 3 = 87 - h?
kow [346]

Answer:

h = 84

Step-by-step explanation:

3 = 87 - h

h + 3 = 87  (Add h to both sides)

h = 84 (Subtract 3 from both sides)

8 0
3 years ago
7 cups of coffee and 4 pieces of toast cost $20 . 5 cups of coffee and 3 pieces of toast cost $14.50 . find the cost of each ite
Angelina_Jolie [31]

Answer:

Step-by-step explanation:

Bánh mì 1.5 đô

Cà phê 2 đô

5 0
2 years ago
PLEASE HELP!!! A blueprint for a fence has a scale of 1:40. The fence in the blueprint is 6in. What is the length of the actual
EastWind [94]
1 : 40 = 6 : 240

On the ground the fence would be 240 inches long

240 / 12 = 20 feet long fnce
4 0
3 years ago
According to an NRF survey conducted by BIGresearch, the average family spends about $237 on electronics (computers, cell phones
Usimov [2.4K]

Answer:

(a) Probability that a family of a returning college student spend less than $150 on back-to-college electronics is 0.0537.

(b) Probability that a family of a returning college student spend more than $390 on back-to-college electronics is 0.0023.

(c) Probability that a family of a returning college student spend between $120 and $175 on back-to-college electronics is 0.1101.

Step-by-step explanation:

We are given that according to an NRF survey conducted by BIG research, the average family spends about $237 on electronics in back-to-college spending per student.

Suppose back-to-college family spending on electronics is normally distributed with a standard deviation of $54.

Let X = <u><em>back-to-college family spending on electronics</em></u>

SO, X ~ Normal(\mu=237,\sigma^{2} =54^{2})

The z score probability distribution for normal distribution is given by;

                                 Z  =  \frac{X-\mu}{\sigma}  ~ N(0,1)

where, \mu = population mean family spending = $237

           \sigma = standard deviation = $54

(a) Probability that a family of a returning college student spend less than $150 on back-to-college electronics is = P(X < $150)

        P(X < $150) = P( \frac{X-\mu}{\sigma} < \frac{150-237}{54} ) = P(Z < -1.61) = 1 - P(Z \leq 1.61)

                                                             = 1 - 0.9463 = <u>0.0537</u>

The above probability is calculated by looking at the value of x = 1.61 in the z table which has an area of 0.9463.

(b) Probability that a family of a returning college student spend more than $390 on back-to-college electronics is = P(X > $390)

        P(X > $390) = P( \frac{X-\mu}{\sigma} > \frac{390-237}{54} ) = P(Z > 2.83) = 1 - P(Z \leq 2.83)

                                                             = 1 - 0.9977 = <u>0.0023</u>

The above probability is calculated by looking at the value of x = 2.83 in the z table which has an area of 0.9977.

(c) Probability that a family of a returning college student spend between $120 and $175 on back-to-college electronics is given by = P($120 < X < $175)

     P($120 < X < $175) = P(X < $175) - P(X \leq $120)

     P(X < $175) = P( \frac{X-\mu}{\sigma} < \frac{175-237}{54} ) = P(Z < -1.15) = 1 - P(Z \leq 1.15)

                                                         = 1 - 0.8749 = 0.1251

     P(X < $120) = P( \frac{X-\mu}{\sigma} < \frac{120-237}{54} ) = P(Z < -2.17) = 1 - P(Z \leq 2.17)

                                                         = 1 - 0.9850 = 0.015

The above probability is calculated by looking at the value of x = 1.15 and x = 2.17 in the z table which has an area of 0.8749 and 0.9850 respectively.

Therefore, P($120 < X < $175) = 0.1251 - 0.015 = <u>0.1101</u>

5 0
3 years ago
What is the equation of a parabola with (−2, 4) as its focus and y = 6 as its directrix? Enter the equation in the box.
SOVA2 [1]
Notice the picture below

the directrix is above the focus point, meaning the parabola is vertical and is opening downwards

now, "p" is the distance from the vertex to the focus point or the directrix, so that means, the vertex is between those two fellows, over the axis of symmetry, x = -2, since "p" is 1 unit, that puts the vertex at -2,5

since the parabola is opening downwards, that means the "p" value is negative, so is -1

\bf \textit{parabola vertex form with focus point distance}\\\\&#10;\begin{array}{llll}&#10;(y-{{ k}})^2=4{{ p}}(x-{{ h}}) \\\\&#10;\boxed{(x-{{ h}})^2=4{{ p}}(y-{{ k}}) }\\&#10;\end{array}&#10;\qquad &#10;\begin{array}{llll}&#10;vertex\ ({{ h}},{{ k}})\\\\&#10;{{ p}}=\textit{distance from vertex to }\\&#10;\qquad \textit{ focus or directrix}&#10;\end{array}\\\\&#10;-----------------------------\\\\

\bf \begin{cases}&#10;p=-1\\&#10;h=-2\\&#10;k=5&#10;\end{cases}\implies (x-(-2))^2=4(-1)(y-5)&#10;\\\\\\&#10;(x+2)^2=-4(y-5)\implies &#10;-\cfrac{1}{4}(x+2)^2=y-5&#10;\\\\\\&#10;\boxed{-\cfrac{1}{4}(x+2)^2+5=y}

4 0
3 years ago
Other questions:
  • What is the answer to the problem 5 + 6 (2+3) ^2
    7·1 answer
  • Describe how you determined which fraction were already in the simplest form
    14·1 answer
  • 83 simplified<br> whoever gets it right is the brainliest
    5·2 answers
  • PLZ HELP ASAP ILL MARK AS BRAINEST!!!!!!!
    12·1 answer
  • Evaluate the expression 2y+12m+3.8 when y= -5 and m=2
    12·1 answer
  • For which value of x must the square root <br><br> 97x<br><br> be further simplified
    7·1 answer
  • Read the following statements:
    15·2 answers
  • Please dont write random things for points, you will be reported.
    13·1 answer
  • Plz help!!!!!!!!!! Plz
    12·1 answer
  • What is -15 in integers
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!