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Xelga [282]
3 years ago
5

Dose anyone know how to solve any of these?

Mathematics
1 answer:
horsena [70]3 years ago
3 0
1) x+23=2x+8
x-2x= 8-23

-x = -15
x=15

2)x+23=2x+8
x-2x=8-23
x= 15

WU= UW= x+23=15+23= 38

3)UV=UW+WV

UV= x+23 + 2x+8

UV=15+23+2*15+8

UV=38+38

UV=76

4) YA=YZ+ ZA

YA= x+12 +6x -13

YA=7x -1

x=15

YA=7*15-1

YA=105-1

YA=104
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Factor the trinomial. You many need to check the discriminant to make sure it can be factored. SHOW YOUR WORK.
lbvjy [14]
Check the discriminant (always a good idea).

b^2 - 4ac 
b = -19
c = -15
a = 10

(-19)^2 - 4(10)(-15)
361 + 600
961

Yes it can be factored, but if you like, you could use the quadratic formula.
x = [- (-19) +/- sqrt(961)]/(2 * 10)
x = [19 +/- 31 ] / 20
x = (19 + 31/20
x = (50)/20
x = 5/2

x = [19 - 31] / 20
x = [- 12]/20
x = -3/5

Getting the factors is a little tricky.
(x - 5/2)(x + 3/5) = 0
The first factor is found by putting 
x - 5/2 in that form and multiplying through by 2
1/2 (2x - 5) The 1/2 comes from multiplying by 2. 

The second factor is
1/5 (5x + 3)

So the equation will look like 
1/2(2x - 5)1/5(5x + 3) = 0 If you multiply by 2 you get
(2x - 5)1/5(5x + 3) = 0 and now multiply by 5 you get
(2x - 5) (5x + 3) 

Check
2x*5x - 25x + 6x - 15
10x^2 - 19x - 15 = 0

So everything works out. 
6 0
3 years ago
if zakyrah has 5 songs and dymin has 2 songs on itunes.if zakyrah has 150 song how many does dymin have
Marianna [84]
60
as 5x30=150
so 2x30=60
3 0
2 years ago
Find the area of this semi-circle with radius, r = 66cm. Give your answer rounded to 1 DP.​
Darya [45]

Answer:

414.857143

Step-by-step explanation:

r=66

=2*66*22/7

=414.857143

4 0
2 years ago
Solve -24 + (1-4)^2​
ElenaW [278]

Answer:

-15

Step-by-step explanation:

-24 + (1-4)^2​    (solve parentheses first)

= -24 + (-3)^2 (solve exponent)

= -24 + 9

= -15

6 0
3 years ago
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WILL GIVE BRAINLIESTIF RIGHT
coldgirl [10]

Answer:

A 2x+6

Step-by-step explanation:

7 0
3 years ago
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