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luda_lava [24]
3 years ago
8

Rivers chemustry class is doing an experiment in which

Mathematics
2 answers:
IRINA_888 [86]3 years ago
6 0
After you complete the sentence we'll comment on what your having trouble with.
dedylja [7]3 years ago
5 0
In which what? please finish the sentence.
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What is the factor to change pounds to kilograms
daser333 [38]
Multiply pounds by 2.205
7 0
3 years ago
Plz help I have no idea how to answer it​
saveliy_v [14]

5. Answer: see explanation

<u>Step-by-step explanation:</u>

If the roots are m and 3m, then x = m and x = 3m

⇒ x - m = 0    and      x - 3m = 0

⇒ (x - m)(x - 3m) = 0

⇒ x² - 4mx + 3m² = 0

Since x² + px + q = 0   then  p = -4m   and q = 3m²

3p² = 3(-4m)²               16q = 16(3m²)

      = 3(16m²)                      = 48m²

      = 48m²

3p² = 48m² = 16q     ⇒           3p² = 16q

**********************************************************************************************

6. Answer: 8 or 18

<u>Step-by-step explanation:</u>

The Area of the entire rectangle (A = L × w) is 12 × 10 = 120

The Area of the shaded region is 72, so the Area of the non-shaded region is 120 - 72 = 48.

There are two non-shaded triangles.

  • Bigger non-shaded Δ: L = 12-x, w = 10  ⇒ A = \dfrac{10(12-x)}{2}
  • Smaller non-shaded Δ: L = x, w = x ⇒ A=\dfrac{x(x)}{2}

Combine the Areas of both triangles and set it equal to the Area of the non-shaded region:

\dfrac{x(x)}{2}+\dfrac{10(12-x)}{2}=48\\\\\\\dfrac{x^2}{2}+\dfrac{120-10x}{2}=48\\\\\\\dfrac{x^2-10x+120}{2}=48\\\\\\x^2-10x+120=96\\\\x^2-10x+24=0\\\\(x-4)(x-6)=0\\\\x - 4 = 0\quad or\quad x-6=0\\x=4\qquad or\qquad x=6\\\\\text{Based on the image provided, it appears that the x-value will be the}\\\text{smallest of the two possible solutions (4), but both solutions are valid.}

Area of ΔBEF:

\text{when x = 4, A =}\ \dfrac{4(4)}{2}=\dfrac{16}{2}=8\\\\\\\text{when x = 6, A =}\ \dfrac{6(6)}{2}=\dfrac{36}{2}=18

5 0
3 years ago
Need word problem solved A washer and a dryer cost 821 combined. The washer costs 79 less than the dryer. What is the cost of th
Leni [432]
Let x be the cost of dryer, y be the cost of washer

x + y =821
x-79 = y

combine 2 equation
we got
x + (x-79) = 821
2x + 79 = 821
2x = 742
x=471

The cost of dryer is $471
3 0
3 years ago
Read 2 more answers
Please help I’ll give brainliest if correct
gregori [183]

Answer:

(-1, -13) is the correct answer

7 0
3 years ago
Decrease 640 by 24 percent​
Mkey [24]

Answer:

486.4

Step-by-step explanation:

640 - (24% × 640) =

(1 - 24%) × 640 =

(100% - 24%) × 640 =

76% × 640 =

76 ÷ 100 × 640 =

76 × 640 ÷ 100 =

48,640 ÷ 100 =

486.4

7 0
3 years ago
Read 2 more answers
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