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3 years ago

Andre can run 2 1/2 miles in 3/4 hour. Find his average speed in miles per hour.

Mathematics

2 answers:

PolarNik [594]3 years ago

8 0

Answer:

3 1/3 mph

Step-by-step explanation:

-____________________-

cestrela7 [59]3 years ago

7 0

Answer:

3 1/3 miles per hour

Step-by-step explanation:

(5/2 ÷ 3/4) = (s ÷1)

(5/2 ÷ 3/4) = 10/3

10/3 = s/1

cross-multiply:

3s = 10

s = 10/3

s = 3 1/3 miles per hour

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siniylev [52]

Answer:

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Step-by-step explanation:

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4 years ago

PLS HELP WILL MARK YOU BRAINLIEST! NO FAKE ANSWERS!<br> Are the images convex or concave polygons?

svp [43]

Answer:

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Step-by-step explanation:

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3 years ago

If one side of a square notebook measures 20 cm, what is the area of the front cover of the notebook?

nexus9112 [7]

Answer:

400cm

Step-by-step explanation:

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3 years ago

Given the position of the particle, what the position(s) of the particle when it’s at rest

choli [55]

The position function of a particle is given by:

$X\mleft(t\mright)=\frac{2}{3}t^3-\frac{9}{2}t^2-18t$

The velocity function is the derivative of the position:

$\begin{gathered} V(t)=\frac{2}{3}(3t^2)-\frac{9}{2}(2t)-18 \\ \text{Simplifying:} \\ V(t)=2t^2-9t-18 \end{gathered}$

The particle will be at rest when the velocity is 0, thus we solve the equation:

$2t^2-9t-18=0$

The coefficients of this equation are: a = 2, b = -9, c = -18

Solve by using the formula:

$t=\frac{-b\pm\sqrt[]{b^2-4ac}}{2a}$

Substituting:

$\begin{gathered} t=\frac{9\pm\sqrt[]{81-4(2)(-18)}}{2(2)} \\ t=\frac{9\pm\sqrt[]{81+144}}{4} \\ t=\frac{9\pm\sqrt[]{225}}{4} \\ t=\frac{9\pm15}{4} \end{gathered}$

We have two possible answers:

$\begin{gathered} t=\frac{9+15}{4}=6 \\ t=\frac{9-15}{4}=-\frac{3}{2} \end{gathered}$

We only accept the positive answer because the time cannot be negative.

Now calculate the position for t = 6:

$undefined$

6 0

1 year ago

A circle of yellow tulips is planted in Cedarburg's central park. Pam measured the circle and calculated that is has a circumfer

lozanna [386]

Answer:

The circle's diameter is $4\ yd$

Step-by-step explanation:

we know that

The circumference of a circle is equal to

$C=\pi D$

where

D is the diameter of the circle

In this problem we have

$C=12.56\ yd$

$\pi=3.14$

substitute the values and solve for D

$12.56=(3.14)D$

$D=12.56/(3.14)=4\ yd$

6 0

3 years ago