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Ostrovityanka [42]
3 years ago
5

Find two numbers that multiply to 16 and also add to -8

Mathematics
1 answer:
mash [69]3 years ago
5 0

Answer:

-4,-4

Step-by-step explanation:

let the numbers be x and y.

x+y=-8

y=-x-8

xy=16

x(-x-8)=16

-x²-8x=16

x²+8x+16=0

x²+4x+4x+16=0

x(x+4)+4(x+4)=0

(x+4)(x+4)=0

x=-4,-4

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The sales tax for an item was $19.20 and it costs $480 before tax. Find the sales tax rate. Write your answer as a percentage
Zigmanuir [339]

Answer:

sales tax rate = 4%

Step-by-step explanation:

In this problem formula to express one term in percentage is used

To express x as percentage of y is given by (x/y*100) %

______________________________________________

Cost of item = $480

sales tax = $19.20

we have to find sales tax rate.

sales tax rate is percentage of cost price which will levied as tax .

thus, we have to find sales tax as percentage of cost price.

using the percentage cost as given above

sales tax as percentage = sales tax/ cost of item *100

sales tax as percentage = 19.20/480 *100 = 4%

Thus, sales tax rate is 4%.

It means that if cost price of item is $100 then $4 will be the sales tax for the item.

5 0
3 years ago
You begin a hike in Death Valley, California, at an elevation of -86 meters. You hike to a point of elevation at 45 meters. What
kotegsom [21]

Answer:

131

Step-by-step explanation:

(-)86+45

86 + 45 = 131

7 0
3 years ago
.65 repeating as a fraction?
Margarita [4]
Hey there 

.65 as a decimal would be <span>13/20
13 divided by 20 = 0.65
0.65 is also know as .65

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</span>
5 0
3 years ago
-50 Points-<br> If segment AC and segment BC are tangent to circle O, find the value of x.
Shkiper50 [21]

Answer:

x = 170 deg

Step-by-step explanation:

A tangent to a circle is perpendicular to the radius of the circle at the point of tangency. That means that in quadrilateral AOBC, angles A and B are right angles and measure 90 deg.

The sum of the measures of the angles of an n-sided polygon is

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In this case, n = 4, so

(4 - 2)180 deg = 360 deg

m<A + m<O + m<B + m<C = 360

90 + x + 90 + 10 = 360

x + 190 = 360

x = 170

Answer: 170 deg

4 0
3 years ago
Read 2 more answers
5. Find the value of x.
goldfiish [28.3K]

Answer:

x = 70

Step-by-step explanation:

Interior angles of a 4 sided shape = 360

80+70 = 150

360-150 = 210

210/3 = 70

8 0
3 years ago
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