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Elena L [17]
4 years ago
7

Write a number sentence for the model. Let one white tile equal +1 and one black tile equal-1.

Mathematics
1 answer:
aalyn [17]4 years ago
3 0
It's all black tiles

and black tile = -1

so
-14 - (- 6) = -8

Answer is D. last one 
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3. Solve each equation, and check your solution.
Alisiya [41]

1) 2m - 16 = 2m + 4

2m - 2m = 4 + 16

0 = 20 (no solution)

2) -4(r + 2) = 4(2 - 2r)

-(r + 2) = 2 - 2r

-r - 2 = 2 - 2r

-r + 2r = 2 + 2

r = 4

3) 12(5 + 2y) = 4y - (6 - 9y)

60 + 24y = 4y - 6 + 9y

60 + 24y = 13y - 6

24y - 13y = -6 - 60

11y = -66

y = -6

7 0
3 years ago
An airplane is flying in a direction of 75° north of east at a constant flight speed of 300 miles per hour. The wind is blowing
Nutka1998 [239]

Answer:

79.7°

Step-by-step explanation:

We resolve the speed of the plane into horizontal and vertical components respectively as 300cos75° and 300sin75° respectively. Since the wind blows due west at a speed of 25 miles per hour, its direction is horizontal and is given by 25cos180° = -25 mph.  We now add both horizontal components to get the resultant horizontal component of the airplane's speed.

So 300cos75° mph + (-25 mph) = 77.646 - 25 = 52.646 mph.

The vertical component of its speed is 300sin75° since that's the only horizontal motion of the airplane. So the resultant vertical component of the airplane's speed is 300sin75° = 289.778 mph

The direction of the plane, Ф = tan⁻¹(vertical component of speed/horizontal component of speed)

Ф = tan⁻¹(289.778 mph/52.646 mph)

Ф = tan⁻¹(5.5043)

Ф = 79.7°

6 0
3 years ago
Solve the Application.
icang [17]

Answer: 1,050 bread crumbs

Step-by-step explanation: First lets add the bread crumbs Jacob and Martha threw in total.

592 + 629 = 1,221 total bread crumbs thrown to the ducks.

If there were 171 bread crumbs left on the floor, and we want to find how many bread crumbs the ducks eat, we can simply subtract 171 from 1,221 bread crumbs.

1,221 - 171 = 1,050 total bread crumbs eaten by the ducks.

3 0
3 years ago
Read 2 more answers
Find the volume of the cylinder. With a radius of 14 in. and height of 12.8 in. Use 3.14 for pi. Round to the nearest tenth.
Marat540 [252]
Hello!

To find the volume, let's use the formula V = 3.14 * r^2 * h

Plug in the values.

V = 3.14 * 14^2 * 12.8

Now solve.

V = 7877.6^3

Your answer is A. :)
5 0
4 years ago
Brianna wants to buy a digital camera for a photography class. One store offers the camera for $48 down and a payment plan of $2
tatyana61 [14]

Answer:

the second store

Step-by-step explain: the second store is 244 but the first store is 300..i hope this helps. 14*12+76=244 and 21*12 + 48 is 300

7 0
3 years ago
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