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3 years ago

7

a taxi cab charges a flat fee of $2.00, plus $0.25 for every mile driven. If the fare comes to $7.75, what equation could be use

d to determine how many miles the taxi drove?

1 answer:

PIT_PIT [208]3 years ago

4 0

Answer:

7.75 = .25x + 2

Step-by-step explanation:

You might be interested in

Which relationship is always true for the angles r, x, y, and z of triangle ABC?

mariarad [96]

That's the second one,

180 - x = r

Whenever two lines cross we get congruent opposite angles and supplemental adjacent angles, i.e. they add to 180 degrees.

The first one is almost right; we have r+y+z=180 and r+x=180 so x=y+z not quite what was written.

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3 years ago

In a statistics class, the standard deviation of the heights of all students was 3.8 inches. The standard deviation of the heig

goblinko [34]

Answer:

The reason why standard deviation of the entire class is greater than standard deviation of males and females considered separately, is that mean values for males and females are different from each other.

Step-by-step explanation:

The concept of mean is well represented by the following formula

mean = $\frac{(x1 + x2 + x3 + ..... + xn)}{N}$ , where x1, x2, xn are the observations and N is the number of observations (population).

Standard deviation represents the distance between each observation and the mean of the population (all observations). The formula for this parameter is:

Standard deviation =√[((x1 - x)² + (x2-x)² + ....+ (xn-x)²)/N-1], where x1, x2,..., xn are the observations and x is the mean value.

In this case you have that each height registered is an observation and the number of observations represents the N value. As you can see if the mean for males is different from that of females their standard deviation will be different too. Usually males have heigths greater than that of females (1.77 vs 1.64, in USA for example), and heights inside each group will be more similar than between groups. Then, when you mix all observation there will be an increase in standard deviation, because you are mixing very different heigths

4 0

3 years ago

A polynomial that has 4 turning points is multiplied by another polynomial that has 9 zeros. What is the minimum degree of the n

pickupchik [31]

For a given degree of the polynomial, the number of turning points is given by n-1, where n is the degree of the polynomial. A polynomial that has x number of zeros is a polynomial of degree x. Thus the polynomial that has 9 zeros and 4 turning points, is a polynomial of degree 9.

5 0

3 years ago

Point P divides the directed segment from A to B in the ratio 9 to 2. The coordinates of point A are

Andreyy89

Answer:

$B =(3.3,1.7)$

Step-by-step explanation:

Given

$A(x_1,y_1) = (-4,-2)$

$P(x,y) = (2,1)$

$m : n = 9 : 2$

Required

The coordinates of $B(x_2,y_2)$

The line segment from ratio is calculated as:

$(x,y) = (\frac{mx_2 + nx_1}{m+n},\frac{my_2 + ny_1}{m+n})$

Substitute: A, P, m and n

$(2,1) = (\frac{9 * x_2 + 2*-4}{9+2},\frac{9*y_2 +2 *-2}{9+2})$

$(2,1) = (\frac{9x_2 -8}{11},\frac{9y_2 -4}{11})$

Multiply through by 11

$(22,11) = (9x_2 -8,9y_2 -4)$

By comparison:

$9x_2 - 8 = 22$

$9y_2 - 4 = 11$

So, we have:

$9x_2 - 8 = 22$

$9x_2 = 22 +8$

$9x_2 = 30$

Solve for x2

$x_2 = 30/9$

$x_2 = 3.3$

$9y_2 - 4 = 11$

$9y_2 = 11+4$

$9y_2 = 15$

Solve for y2

$y_2 =15/9$

$y_2 =1.7$

So, the coordinates of B is:

$B =(3.3,1.7)$

5 0

3 years ago

Find the base of a parallelogram with a height of 13.5 yards in an area of 159.3 yards

BigorU [14]

Answer:

b = 11.8 yd

Hope this helps! I need brainliest to level up!

( You already know this XD )

4 0

3 years ago