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andrey2020 [161]
3 years ago
6

If 4 is subtracted from twice a number, the result is 10 less than the number. Find the number. *

Mathematics
2 answers:
motikmotik3 years ago
8 0

Answer:

the answer is -6

Step-by-step explanation:

drek231 [11]3 years ago
8 0

Answer:

x =-6

Step-by-step explanation:

Let the unknown number be x

2(x)-4=x-10\\\\2x -4=x-10\\\\\mathrm{Add\:}4\mathrm{\:to\:both\:sides}\\2x-4+4=x-10+4\\\\Simplify\\2x=x-6\\\\\mathrm{Subtract\:}x\mathrm{\:from\:both\:sides}\\2x-x=x-6-x\\\\Simplify\\x=-6

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This is a simple exercise with rates.
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[3.0479×10⁸ dollars] ÷ [2.102×10⁶ dollars] = 1,45 x 10²





7 0
4 years ago
Given: KLMN is a trapezoid m∠N = m∠KML ME ⊥ KN , ME = 3 5 , KE = 8, LM KN = 3 5 Find: KM, LM, KN, Area of KLMN
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A) Find KM∠KEM is a right angle hence ΔKEM is a right angled triangle Using Pythogoras' theorem where the square of hypotenuse is equal to the sum of the squares of the adjacent sides we can answer the 
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b)Find LMThe ratio of LM:KN is 3:5 hence if we take the length of one unit as xlength of LM is 3xand the length of KN is 5x ∠K and ∠N are equal making it a isosceles trapezoid. A line from L that cuts KN perpendicularly at D makes KE = DN
KN = LM + 2x 2x = KE + DN2x = 8+8x = 8LM = 3x = 3*8 = 24
c)Find KN Since ∠K and ∠N are equal, when we take the 2 triangles KEM and LDN, they both have the same height ME = LD.
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d)Find area KLMNArea of trapezium can be calculated using the  formula below Area = 1/2 x perpendicular height between parallel lines x (sum of the parallel sides)substituting values into the general equationArea = 1/2 * ME * (KN+ LM)          = 1/2 * 3√5 * (40 + 24)         = 1/2 * 3√5 * 64         = 3 x 2.23 * 32         = 214.66 units²
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