Help ASAP with #2 no links or I will report

A survey asked 10 boys and 10 girls how many text messages they sent the previous day. The

Genrish500 [490]

Answer:

You might want to put that in a picture, because that makes very little sense.

4 0

3 years ago

I need help on this???

Aliun [14]

Use the geometric mean for right triangles here. Like this $\frac{9}{y}= \frac{y}{7}$ . Cross multiply to get $y^{2}=63$ , and $y= \sqrt{63}$ . That simplifies down to $y= \sqrt{9*7}$ . Pull out the 9 as a perfect square of 3 and you're left with $y=3 \sqrt{7}$ , first choice above.

4 0

3 years ago

Read 2 more answers

suppose a farmer encloses a rectangular region of a land next to a river. fencing will be used on 3 sieds, and none is needed al

nexus9112 [7]

Answer:

Dimensions :

x (the longer side, only one side with fence ) = 90 ft

y ( the shorter side two sides with fence ) = 45 ft

Total fence used 45 * 2 + 90 = 180 ft

A(max) =

Step-by-step explanation: If a farmer has 180 ft of fencing to encloses a rectangular area with fence in three sides and the river on one side, the farmer surely wants to have a maximum enclosed area.

Lets call "x" one the longer side ( only one of the longer side of the rectangle will have fence, the other will be along the river and won´t need fence. "y" will be the shorter side

Then we have:

P = perimeter = 180 = 2y + x ⇒ y = ( 180 - x ) / 2 (1)

And A (r) = x * y

A(x) = x * ( 180 - x ) /2 ⇒ A(x) = (180/2) *x - x² / 2

Taking derivatives on both sides of the equation :

A´(x) = 90 - x

Then if A´(x) = 0 ⇒ 90 - x = 0 ⇒ x = 90 ft

and from : y = ( 180 - x ) / 2 ⇒ y = 90/2

y = 45 ft

And

A(max) = 90 * 45 = 4050 ft²

4 0

3 years ago

If a tower casts a shadow 11 feet long the distance from the top of the tower to the end of the shadow is 61 feet .. How many fe

Svetach [21]

$Use\ the\ Pythagoras\ Theorem:\\\\H^2+11^2=61^2\\\\H^2+121=3721\ \ \ \ |subtract\ 121\ from\ both\ sides\\\\H^2=3600\\\\H=\sqrt{3600}\\\\\boxed{H=60}\\\\Answer:Tower\ is\ 60\ feet\ tall.$ Answer here