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12345 [234]
2 years ago
9

-4x+5(20/11)=-4 Please explain how to get x, thank u!

Mathematics
1 answer:
avanturin [10]2 years ago
6 0

-4x + 5 \left(\dfrac{20}{11}\right) =-4\\\\\implies \dfrac{100}{11} = -4+4x\\\\\implies 100 = -44+44x\\\\\implies 44x = 100 +44 = 144\\\\\implies x = \dfrac{144}{44} = \dfrac{36}{11}

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Choose the expression that represents “three less than seven times a number.”
tamaranim1 [39]

Answer:

x7-3 as number is multiplied by 7 then subtracted by 3

3 0
3 years ago
What is the slope of the line through the points (4, 2) and (-16, -6)?
Harrizon [31]
Gradient = change in y /change in x so -6-2 =-8 / -16-4 = -20 so -8/-20 = 0.4 so gradient = 0.4
3 0
3 years ago
Check out the photo for the question
Anestetic [448]

Answer:

50

Step-by-step explanation:

42/n³∑k²+12/n²∑k+30/n∑1

=42/n³[n(n+1)(2n+1)/6]+12/n²[n(n+1)/2]+30/n [n]

=7n(n+1)(2n+1)/n³+6n(n+1)/n²+30

=7(n+1)(2n+1)/n²+6(n+1)/n+30

=[7(2n²+3n+1)+6(n²+n)+30n²]/n²

=[14n²+21n+7+6n²+6n+30n²]/n²

=[50n²+27n+7]/n²

=[50+27/n+7/n²]

→50 as n→∞

because 1/n,1/n²→0 as n→∞

4 0
3 years ago
Read 2 more answers
Pleaseeeeee helppppp!!!!!
Paul [167]
P=6\cdot\dfrac{1}{2}ah=3ah\\
a=3 \text{ ft}\\
h=2.6\text{ ft}\\\\
P=3\cdot3\cdot2.6=23.4 \text{ ft}^2 \Rightarrow B
6 0
3 years ago
One number is 7 more than another. The difference between their squares is 161. What are the numbers?
olga nikolaevna [1]
Let's say the numbers are "a" and "b"

now, we know one of them is 7 more than the other, so hmmm let's say "b" is 7 more than "a", so b = a + 7

the difference of their squares is 161, alrite

\bf a^2-b^2=161\qquad b=a+7\implies a^2-(a+7)^2=161
\\\\\\
a^2-(a^2+14a+49)=161\implies \underline{a^2-a^2}-14a-49=161
\\\\\\
-14a-49=161\implies -49-161=14a\implies -210=14a
\\\\\\
\cfrac{-210}{14}=a

and surey you know how much that is

now, what's "b"? well, b = a + 7
3 0
3 years ago
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