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il63 [147K]
3 years ago
9

What is a number increased by 15 is 38

Mathematics
1 answer:
snow_lady [41]3 years ago
5 0

Answer:

23

Step-by-step explanation:

Let n be the number

n+15 = 38

Subtract 15 from each side

n+15-15 = 38-15

n =23

The number is 23

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The equation x2 − 9 = 0 has real solution(s).
tatiyna

Answer:

The roots are real and unequal (3, -3)

Step-by-step explanation:

x²-9=0

ax²+bx+c=0

Comparing we get,

a= 1

b= 0

c = -9

Determinant: b²-4ac

= 0² - 4(1)(-9)

= 36>0

D > 0

Therefore, the equation has real and unequal roots.

Algebraic identity:

x² - a² = (x-a)(x+a)

Using this identity

x²-9 = (x+3)(x-3)

Roots are 3 and -3 which are real and not equal to each other

Hope this answer helps you ..

6 0
4 years ago
Read 2 more answers
I need help finding missing angles ​
Citrus2011 [14]

Answer:

1 = 128 degrees

2 = 52 degrees

3 = 47 degrees

4 = 133 degrees

5 = 81 degrees

Step-by-step explanation:

angle 2 and 52 degrees are corresponding angles so they are equal.

angle 3 and 47 degrees are corresponding angles so they are equal.

angles 1 and 2 are supplementary angles so their sum is 180 degrees.

angles 3 and 4 are supplementary angles so their sum is 180 degrees.

angle 5 = 180 - 52 - 47 = 81 degrees

8 0
3 years ago
The diameter of the larger circle is 12.5 cm. The diameter of the smaller circle is 3.5 cm.
erik [133]
Area = 3.14*(12.5^2 - 3.5^2)/4 =113.04

Answer is B
3 0
3 years ago
Read 2 more answers
if trangle pqr is translated 4 units to the right to form triangle p'q'r' how are the values on the orderd pairs affected by the
Vesna [10]

Answer:

The x-coordinate of each point will increase by 4.

Step-by-step explanation:

So Triangle PQR is being translated 4 units to the <em>right</em>. Since we are going to the <em>right</em>, this is a shift on the x-coordinate.

And since we're going 4 units, every x-coordinate is going to be added by 4.

In other words, if we have:

A(x,y)

Then the new coordinate, A', is:

A(x,y)\rightarrow A' (x+4,y)

So, let's find the new coordinates of each point.

Point P is (-5,6). So:

P(-5,6)\rightarrow P'(-5+4,6)=P'(-1,6)

The new Point P is at (-1,6).

Point Q is at (2,6). So:

Q(2,6)\rightarrow Q'(2+4,6)=Q'(6,6)

The new Point Q would be at (6,6).

And Point R is at (-3,2). So:

R(-3,2)\rightarrow R(-3+4,2)=R(1,2)

The new Point R is at (1,2).

And we're done!

5 0
3 years ago
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Kwame rode bicycle for a distance of xkm and walked for another 1/2 hour at a rate of 6km/hour. If Kwame covered a total distanc
ElenaW [278]

1/2 hour at 6 km/ hour = 3 km.

Total distance was 10km, so he rode his bike for 10 - 3 = 7 km

x = 7

7 0
3 years ago
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