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shusha [124]
3 years ago
8

PLEASE HELP THIS IS MY EXAM

Mathematics
1 answer:
Anna35 [415]3 years ago
6 0
I think the answer is D
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onyango wishes to fence a rectangular research plot using 100 m of wire .one end of the plot has a wall already erected .calcula
earnstyle [38]

Answer:

1250 m²

Step-by-step explanation:

Let x and y denote the sides of the rectangular research plot.

Thus, area is;

A = xy

Now, we are told that end of the plot already has an erected wall. This means we are left with 3 sides to work with.

Thus, if y is the erected wall, and we are using 100m wire for the remaining sides, it means;

2x + y = 100

Thus, y = 100 - 2x

Since A = xy

We have; A = x(100 - 2x)

A = 100x - 2x²

At maximum area, dA/dx = 0.thus;

dA/dx = 100 - 4x

-4x + 100 = 0

4x = 100

x = 100/4

x = 25

Let's confirm if it is maximum from d²A/dx²

d²A/dx² = -4. This is less than 0 and thus it's maximum.

Let's plug in 25 for x in the area equation;

A_max = 25(100 - 2(25))

A_max = 1250 m²

5 0
3 years ago
Reduce -8 + b2 by 5 + b2.<br><br> -3<br> 2b² - 3<br> -13
Eddi Din [679]
-8+b2-(5+b2). Since the - is outside the paranthesis the signs inside change: -8+b2-5-b2. -8-5=-3, b2-b2=0. Your answer: -3 :)
5 0
3 years ago
Read 2 more answers
1) 4x + 3y = -13<br>-5x + 2y = -24​
Nataliya [291]
(4x+3y=-13) * 2
(-5x+2y=-24)*3
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8x+6y=-26
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-15x+6y=-72
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23x=46
X=2
6 0
3 years ago
a recipe requires 1/4 pound of potatoes to make 3 servings of soup Don has one and a half pound of potatoes how many servings ca
tamaranim1 [39]
18 servings of soup he can make with the potatoes!
8 0
3 years ago
Can anyone help me answer this
ANEK [815]

Answer:

Step-by-step explanation:

i might be wrong but it might be 65

6 0
2 years ago
Read 2 more answers
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