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lisabon 2012 [21]
2 years ago
14

Pieter wrote and solved an equation that models the number of hours it takes to dig a well to a level of 72 feet below sea level

.
7h – 5(3h – 8) = –72
Which statement is true about Pieter’s solution?

1. It cannot be a fraction or decimal because the depth of the well is a whole number.

2. It must be a positive number since it represents a number of hours.

3. It must be a negative number because the depth is below sea level.

4.It cannot be greater than –72 because that is the depth of the well.
Mathematics
1 answer:
jek_recluse [69]2 years ago
8 0

Answer:

Step-by-step explanation:

Is this the entire question? Some of it makes no sense without a diagram or something.

To get rid of A you actually have to solve the equation.

7h – 5(3h – 8) = –72        Remove the brackets

7h - 15h + 40 = - 72          Combine the like terms

- 8h + 40 = - 72                Subtract 40 from both sides

- 8h = -112                        Divide by -8

    h = 14

Well the depth is a whole number so A is true.

We don't know anything about time. But the answer is positive.

C is false because B is true.

We don't know exactly what the depth of the well is.

I would pick A, but you need the entire question.

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​Together, teammates Pedro and Ricky got 2673 base hits last season. Pedro had 277 more hits than Ricky. How many hits did each
ioda

Answer:

Pedro got 1520 base hits and Ricky got 1243.

Step-by-step explanation:

This question can be solved by a system of equations.

I am going to say that:

x is the number of base hits that Pedro got.

y is the number of base hits that Ricky got.

Pedro and Ricky got 2673 base hits last season.

This means that x + y = 2763

Pedro had 277 more hits than Ricky.

This means that x = y + 277

Replacing in the first equation

x + y = 2763

y + 277 + y = 2763

2y = 2486

y = \frac{2486}{2}

y = 1243

x = y + 277 = 1243 + 277 = 1520

Pedro got 1520 base hits and Ricky got 1243.

4 0
3 years ago
9/5 rename as a mixed number
Anon25 [30]
4 1/5 because 4+5=9 so 4 then you will have 1/5
3 0
2 years ago
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What is the factored form of r^27 - s^30
svlad2 [7]

Answer:

(r^9-s^10) (r^18+r^9 s^10 + s^20)

Step-by-step explanation:

hope this helps :)

8 0
3 years ago
What is 98% as a fraction in its simplest form
Nat2105 [25]
98% = 98/100 = 49/50
7 0
3 years ago
Graph the quadrilateral WXYZ with vertices W(–4, –1), X(–6, 1), Y(–8, –1), and Z(–6, –3). Rotate the figure 90° counterclockwise
Anika [276]
<h2>Answer:</h2>

Option C

<h2>Step-by-step explanation:</h2>

When you rotate a point you could rotate it in Clockwise direction because that's how the hand of a clock move, or rotate it in Counterclockwise direction that's the opposite rotation. In math, counterclockwise is defined as being a positive rotation while clockwise is defined as being a negative rotation. Rotating a whole shape means we're rotating every point in the shape.

On the coordinate plane, consider the point (x,y). To rotate this point by 90° around the origin in counterclockwise direction, you can always swap the x- and y-coordinates and then multiply the new x-coordinate by -1. In a mathematical language this is as follows:

(x,y)\rightarrow(-y,x)

By applying this rule to every point we have:

W(-4, -1) \rightarrow W'(1, -4) \\ \\X(-6, 1) \rightarrow X'(-1, -6) \\ \\ Y(-8, -1) \rightarrow Y'(1, -8) \\ \\ Z(-6, -3) \rightarrow Z'(3, -6)

The figure below shows the original shape in green while the rotated shape is the one in red. As you can see, this figure matches the option C.

3 0
3 years ago
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