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Delvig [45]
3 years ago
13

Which of the following are incorrect expressions for slope? Check all that apply.. . A. Change in the dependent variable relativ

e to change in the independent variable. B. x2-x1/y2-y1. C. run/rise. D. delta y/delta x. .
Mathematics
2 answers:
n200080 [17]3 years ago
7 0
A. B. and C. are incorrect expressions for the slope.

m (slope) = rise/run = y2-y1/x2-x1 = change in the independent variable relative to the change in dependent variable 

y is the independent variable and x is the dependent variable
Oxana [17]3 years ago
7 0

Answer:

(B) and (C)

Step-by-step explanation:

The slope or gradient of a line is a number that describes both the direction and the steepness of the line. Slope can be  calculated by finding the ratio of the "vertical change" to the "horizontal change" between two different points on a line.

Thus, from the definition of the slope, we have

(A) Slope=Change in the dependent variable relative to change in the independent variable.

which is correct expression for the slope.

(B) S=\frac{y_{2}-y_{1}}{x_{2}-x_{1}}

which is the formula for the slope.

Now, the given option is S=\frac{x_{2}-x_{1}}{y_{2}-y_{1}}

which is incorrect.

(C) The slope of is given as rise over run that is \frac{rise}{run} but the given option is \frac{run}{rise} which is incorrect.

(D) The slope formula is given as:

S=\frac{{\delta}y}{{\delta}x}

which is the correct expression.

Therefore, the options are (B) and (C) which are incorrect expressions for slope

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The scale on a map is 1: 75 000. (a) Calculate the ACTUAL distance, in km, between two places which are 16 cm apart on the map.
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Answer:

a. 1 200 000 km

b. 0.000 773 cm

c. 67 500 000 000 km²

d. 0.000 000 016 cm²

Step-by-step explanation:

a. Calculate the ACTUAL distance, in km, between two places which are 16 cm apart on the map.

Since the scale is 1 : 75000 that is 1 cm : 75000 km, we want to find the actual distance of 16 cm on the map. Let x be the actual distance in km.

So, 1 cm : 75000 km = 16 cm : x km

So, 1 cm/75000 km = 16 cm/x km

Thus x km = 16 cm × 75000 km/1 cm = 1 200 000 km

(b) Calculate length of a road on the map which is 0.58 km.

Let y be the length of road on the map. So, using our scale

1 cm : 75000 km = y cm : 0.58 km

So, 1 cm/75000 km = y cm/0.58 km

Thus y cm = 0.58 km × 1 cm/75000 km = 0.000 773 cm

(c) Calculate, in km², the ACTUAL area of a lake which is 12 cm2 on the map.

Since the scale is 1 : 75000 , the scale for the area would be the square of this. So, 1² : 75000² = 1 : 5 625 000 000 which is 1 cm² : 5 625 000 000 km²

Let z be the actual area of the lake.

So,  1 cm² : 5 625 000 000 km² = 12 cm² : z km²

So, 1 cm²/5 625 000 000 km² = 12 cm²/z km²

Thus z km² = 12 cm² × 5 625 000 000 km²/1 cm² = 67 500 000 000 km²

(d) Calculate the area of a play field on the map which has has an actual area of 90 km².

Let a represent the area of the play field on the map. Using our scale for the area,

1 cm² : 5 625 000 000 km² = a cm² : 90 km²

So, a cm² = 90 km² × 1/5 625 000 000 km² = 0.000 000 016 cm²

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