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pishuonlain [190]
3 years ago
12

What is the result of subtracting the second equation from the first? -4x-2y=-2 x-2y=9

Mathematics
1 answer:
diamong [38]3 years ago
6 0

Answer:

x=2.2

y=-3.4

Step-by-step explanation:

subtract the second from the first

-5x=-11

x=2=2

substituting by x in the first equation

so y=-3.4

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Martin is cleaning the tires of his bicycle. He notices that his bicycle tire has a radius of 8 inches. How much bigger is the a
algol [13]

Strange question, as normally we would not calculate the "area of the tire." A tire has a cross-sectional area, true, but we don't know the outside radius of the tire when it's mounted on the wheel.

We could certainly calculate the area of a circle with radius 8 inches; it's

A = πr^2, or (here) A = π (8 in)^2 = 64π in^2.

The circumference of the wheel (of radius 8 in) is C = 2π*r, or 16π in.

The numerical difference between 64π and 16π is 48π; this makes no sense because we cannot compare area (in^2) to length (in).

If possible, discuss this situatio with your teacher.



8 0
3 years ago
For his birthday, Mr. Robin and four of his friends went to a Math museum to learn about new intergalactic math. They each got a
Helen [10]

Answer: $10

Step-by-step explanation:

Given

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If each one of them bought a calculator then the total spendings are \$110

Suppose the cost of each calculator is \$\ x

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For the group, it is 5(x+12)

Equate this to total spendings

\Rightarrow 5(x+12)=110\\\Rightarrow x+12=22\\\Rightarrow x=\$\ 10

thus, the cost of each calculator is \$ 10

4 0
3 years ago
The radius of a circle is 18.1 cm. Find the circumference to the nearest tenth.
Hoochie [10]

Answer:

C = 113.73 round it to the nearest tenth 114

8 0
3 years ago
How do you solve this problem? What is the answer?
zmey [24]

9514 1404 393

Answer:

  65 feet

Step-by-step explanation:

The problem involves finding the perimeter of a rectangle, then making adjustments to remove parts of the perimeter that aren't wanted.

The perimeter of a rectangle is given by the formula ...

  P = 2(L+W)

For Aubrey's 12' × 8' room, the perimeter is ...

  P = 2(12' +8') = 40'

This is the length of the border Aubrey needs at the ceiling.

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At "waist-high", we need to subtract the total width of all the windows and doors. That total is ...

  3' + 4' + 3' + 5' = 15'

So, the waist-high border is 40' -15' = 25'.

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The total amount of border Aubrey needs is ...

  ceiling border + waist-high border = 40' + 25' = 65'.

Aubrey needs 65 feet of border.

4 0
3 years ago
Anastasia spent half of her weekly allowance at the movies. To earn more money her parents let her wash the dog for $4.70. What
Sedaia [141]
$17.60 is what she started out with. If she ended with $13.50, subtract the $4.70 so you get $8.80. Then you'd divide that by .5 to get 17.60.
4 0
3 years ago
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