Help please x = 4 7 9

Charlie needs to make a total of 40 deliveries this week. So far he has completed 32 of them. What percentage of his total deliv

xz_007 [3.2K]

Answer:80%

Step-by-step explanation:

He needs to make 40 deliveries and he has allready done 32.

if 40 is the 100%

32 is 80%

Using Algebra:

40 - 100%

32 - x%

Therefore:

X%= 32*100%/40 = 80%

7 0

3 years ago

A rectangular area is to be enclosed by a wall on one side and fencing on the other three sides. If 18 meters of fencing are use

Rashid [163]

Answer:

$A = L W= 9*\frac{9}{2}=\frac{81}{2} m^2$

Step-by-step explanation:

For this case we assume that the total perimeter is 18 ft, we have a wall and the two sides perpendicular to the wall measure x units each one so then the side above measure P-2x= 18-2x.

And we are interested about the maximum area.

For this case since we have a recatangular area we know that the area is given by:

$A= LW$

Where L is the length and W the width, if we replace from the values on the figure we got:

$A(x)= x *(18-2x) = 18x -2x^2$

And as we can see we have a quadratic function for the area, in order to maximize this function we can use derivates.

If we find the first derivate respect to x we got:

$\frac{dA}{dx} = 18-4x=0$

We set this equal to 0 in order to find the critical points and for this case we got:

$18-4x=0$

And if we solve for x we got:

$x=\frac{18}{4}=\frac{9}{2} m$

We can calculate the second derivate for A(x) and we got:

$\frac{d^2 A}{dx^2}= -4$

And since the second derivate is negative then the value for x would represent a maximum.

Then since we have the value for x we can solve for the other side like this:

$L= 18-2x = 18-2 \frac{9}{2}= 18-9 =9m$

And then since we have the two values we can find the maximum area like this:

$A = L W= 9*\frac{9}{2}=\frac{81}{2} m^2$

8 0

3 years ago

13 POINTS!! The teacher in Lizzie Gunderson's drama class assigns weights to students' performances. Fifty percent for script me

Anit [1.1K]

I think this is right, her average grade is 85%

5 0

4 years ago

Last year a large trucking company delivered 9.0* 10^5 tons of goods with an average value of $17,000 per ton. What was the tota

Dafna1 [17]

1.53*10^10 because the total value would = 17,000(9.0*10^5) which is equals, when multiplied, 15300000000. Which is equivalent to 1.53*10^10

5 0

4 years ago

Read 2 more answers

The orthocenter of a triangle may lie outside the triangle because an altitude does not necessarily intersect the____

kap26 [50]

Answer: sides

Step-by-step explanation:

The orthocenter of the triangle will be the intersection of the three altitudes of a triangle. The orthocenter has several vital properties with other parts of a triangle, including the area ,incenter circumcenter and more. Typically, the orthocenter is represented by letter H.

The altitude of a triangle is a line that passes through the vertex of a triangle and it is also perpendicular to the opposite side. The orthocenter of a triangle can lie outside the triangle because an altitude may not necessarily intersect the side.

8 0

3 years ago