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worty [1.4K]
3 years ago
7

Someone please help !

Mathematics
1 answer:
sergejj [24]3 years ago
5 0
           7x-3
_______________
(7^x-1)(7^2x+7x+1)

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If 70% of a number is 42 and 15% of the same number is 9, find 85% of that number.
BigorU [14]

Answer:  51

Step-by-step explanation:

let x be the number.

(70%)x = 42

0.7 x = 42

x = 60

we check 15% x 60 = 0.15 x 60 = 9, which is true.

85% of that number = 85% x 60 = 0.85 x 60 = 51.

6 0
3 years ago
Read 2 more answers
The cost for 15 cases of oranges is $75. What is the cost for 1 case? *
postnew [5]

Answer:Ok I This question can be solved using a system of equation, which requires translating the above word problem into something that can be algebraically

Let O=oranges and  Let G=Grapefruit

5O +8G=235

3O + 2G=85

To solve, you must isolate one of the variables and then work from there. To do that multiply both sides of the bottom or second equation by four and then subtract the bottom equation from the top.

Which would look like this

5O +8G=235

12O + 8G= 340

Then subtract the bottom from the top to get this

-7O=-105

Solving for O we divide both sides by -7, and end up with O=15

Plugging that value back into one of our original equations to solve for G we get this

3(15) + 2G= 85

45 +2G=85

2G=40

G=20

So 1 case of each altogether would equal 15+20, or $35.

<h3>Hope this helps have a awesome night/day❤️✨</h3>

Step-by-step explanation:

4 0
3 years ago
Read 2 more answers
it costs $2.48 for a 16 ounce jar of peanut butter and $5.44 for a 40 ounce jar. which jar is the better buy
gogolik [260]
Second one, please mark branliest
7 0
3 years ago
A circle centered at the origin contains the point
valentina_108 [34]

Answer:

Yes, the distance from the origin to the point (8,√17) is 9 units.

Step-by-step explanation:

The equation of a circle centered at the origin with radius , r has equation:

{x}^{2}  +  {y}^{2}  =  {r}^{2}

Since the circle passes through (0,-9), the radius is 9 units because (0,-9) is 9 units from the origin.

We substitute the radius to get:

{x}^{2}  +  {y}^{2}  =  {9}^{2}

{x}^{2}  +  {y}^{2}  =  81

If (8,√17) lies on this circle, then it must satisfy this equation:

{8}^{2}  +  { (\sqrt{17} )}^{2}  = 64 + 17 = 81

This is True.

This means the distance from (8,√17) is 9 units from the origin.

6 0
3 years ago
a square has a side of 6.25 feet what is the area in square feet round to the correct significant digits
Ymorist [56]
39 square feet
6.25 squared is 39.0625
4 0
4 years ago
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