Someone please help

Mathematics

1 answer:

VladimirAG [237]3 years ago

6 0

The top answer is correct.

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20a-30b can I know the answer (*_*)

lys-0071 [83]

Answer:

$20a - 30b \\ \\ 10(2a - 3b)$

it's was helpful to you

8 0

3 years ago

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Secant DB intersects secant DZ at point D. Find the length of DY

netineya [11]

By the Intersecting Secants Theorem we have
2x(2x+7)=x(x+23)
4x^2+14x=x^2+23x
3x^2=9x
3x=9
x=3
Since DY is length 2x,
the length of DY is 6.

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3 years ago

Using the quadratic formula to solve 5x = 6x2 – 3, what are the values of x?

elena55 [62]

6x2 -5x –3 = 0
a = 6 b=-5 and c=-3

x = [-b +-sq root (b² -4ac)] / 2a
x = [--5 +-sq root (25 -4*6*-3)] / 2*6
x = [5 +- sq root (25 +72)] / 12
x = [5 +- sq root (97)] / 12

x1 = [5 + 9.8488578018 ] / 12
x1 = 14.8488578018 / 12
x1 = 1.2374048168 

x2 = [5 - 9.8488578018 ] / 12
x2 = -4.8488578018 / 12
x2 = -0.4040714835

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4 years ago

(09.04 MC)

Sloan [31]

Please mark me as brainleist

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2 years ago

Could someone please help me answer this math question

Greeley [361]

Explanation

5 students got 6 mark each, 4 students got 7 marks each, 7 students got 8 marks each, 10 students got 9 marks each and 4 students got 10 marks each.

(a) Range is the difference of highest mark and lowest mark. Here, the highest mark is 10 and lowest mark is 6.

So, the range of mark $= 10-6 = 4$

(b) Total number of students in the group $= 5+4+7+10+4= 30$

(c) Mean is the simple average. So, for finding the Mean, we will divide the total marks obtained by all students by the total number of students.

Total marks obtained by all students

$= (6*5)+(7*4)+(8*7)+(9*10)+(10*4)\\ \\ = 30+28+56+90+40 = 244$

So, the Mean mark of the group $=\frac{244}{30}=8.13333....$

6 0

3 years ago