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liraira [26]
3 years ago
9

Solve the simultaneous equations: 3a-2b=14 12a+9b=39

Mathematics
1 answer:
kirill [66]3 years ago
5 0
Use elimination
Multiply first equation by 4
12a - 8b = 56
12a + 9b = 39
Subtract both
-17b = 17
b = -1
Plug in -1 for b
3a - 2(-1) = 14
3a = 12, a = 4
Final answer: a = 4, b = -1
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8 0
4 years ago
The length of a rectangle is twice its width. if the area of the rectangle is 128 ft2 , find its perimeter.
kupik [55]
Length(l)= 2w
Width(w)= w
Area(A) = l*w

A= 128 ft²
128= l*w
128= (2w)w
2w²= 128
w²= 64
w=√64= 8 ft
w= 8 ft

length(l)= 2w
l=2(8)
l=16 ft

P= 2l+2w
P=2(16)+2(8)= 32+16= 48ft
P= 48ft

Answer:
The Perimeter of this rectangle is 48 feet.


Leave any questions you still have in the comments below please! Thank you! Hope this helped! :)
5 0
3 years ago
Absolute value of z=-1+sqrt(3i)?
nasty-shy [4]

Answer:

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Step-by-step explanation:

6 0
3 years ago
The latte is covered with a milk foam heart is covering 55 square cm of the coffee, then what is the area of the coffee NOT cove
Marysya12 [62]

Answer:

Step-by-step explanation:

The latte is what covered the coffee, Caffe latte is a coffee drink made with espresso and steamed milk, and this latte do form heart on the coffee, then we are told that the area of the latte heart is 55cm²

Then, space where latte is not form has a diameter 4cm

Then the radius is diameter divided by 2

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Then area of the circle which for the surface for the coffee is πr²

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A=3.142×2²

A=12.568cm².

Area of coffee not covered is

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