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Mathematics

2 answers:

Vladimir [108]3 years ago

7 0

Answer:

It is A I had this last week.

Step-by-step explanation:

VMariaS [17]3 years ago

4 0

Answer:

I thinks its A

But im not sure tho

Step-by-step explanation:

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Please help i have 2 questions thank you very much.

Rudik [331]

Hello!

Question 1
We first have to convert everything to yards since the concrete is charged by the cubic yards

15 feet = 5 yards
15 feet = 5 yards
3 inches = 0.08333

Multiply these to find the volume

5 * 5 * 0.08333 = 2.08325

Multiply this by the cost

2.08325 * 46 = 95.83

The answer is C) $95.83
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Question 2

You have to find the volume of the first pyramid

The equation we use is $V = \frac{lwh}{3}$

V is volume
l is length
w is width
h is height

Put in the values we know

$V = \frac{16 * 16 * 28}{3}$

Multiply

$V = \frac{7168}{3}$

Divide

V = 2389.3333

Now we use this to find the side length of the second pyramid

$2389.333 = \frac{lw * 112}{3}$

Multiply both sides by 3

7167.999 = lw * 112

Divide both sides by 112

63.9999 = lw

Since it is a square pyramid we know that sides are equal

63.999 = l^2

Take the square root of both sides

8 = l

The answer is B) 8in

Hope this helps!

8 0

3 years ago

Lucy is saving money each week to save up for a new laptop. After 4 months she has $180. Find the amount she has after 6 months

Andrew [12]

Answer:

$220 and 100 is y-intercept

Step-by-step explanation:

To start off the problem, what we have here is the a linear equation. A linear equation has symnols that represent itself. The equation is y= mx+b

y= outcome

m= slope (it can be negative, positive, a fraction or even a decimal!!!)

b= y-intercept or the value of "y" when "x" is zero

x= "x" value (in this case it would be the amount of months!)

In this scenario it is showing the increase or decrease of what Lucy had earned. We know she earned money so, in this equation we see positive number.

Answering the question, we see the equation and we know the format of it and what it represent.

So in other words, what does the 100 represent? Well it represent the y-intercept if we graph this. Or we could say the 100 represent the amount of dollars Lucy had before saving up money for her laptop. We can also include from the linear equation is that Lucy is earning 20 dollars each month!

Besides that, the real question is how much does Lucy have after 6 months!? We can find the answer through many ways. We can answer by looking at a graph, solving it algebraically or even by a table!

Let try to solve it algebraically.

Step 1: Set up the equation that we are given

y= 20x+100

Step 2: Let replace "x" with the amount of months Lucy needs to know.

y= 20x+100

y= 20 (6) + 100

Step 3: Solve the equation. How?

We see two numbers that needs to multiplied. Then we see the addition sign. So we then add what we have when we multiply

y= 20 (6) + 100

y= 120 +100

y= 220

The answer is 220! So after 6 months, Lucy will have 220 dollars saved up for her new laptop!!

I hope you understand the problem and that I made it clear. If you have any questions or comment, PLEASE don't be afriad to ask! I would love to explain or even help out even further. I have attached a picture of solving the problem by algebraically and by a table! Again, hope I helped and have a great day!!!