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3 years ago

Help please Simplify the following expression. 5 (2. - 3) + 4(x + 1)

Mathematics

1 answer:

Step2247 [10]3 years ago

5 0

Answer:

Step-by-step explanation:

(x+1 = whatever the letter x represents the multiply it to 4 then do 2. - 3= -1 x 5= 4 + the sum of 1 and x times 4. Hope it helps <3

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katrin [286]

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4 years ago

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Hitman42 [59]

The answer that I got for this question:

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3 years ago

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5. What is the area of a trapezoid with the following measurements? Base 1=15

zaharov [31]

Answer:

129.5 cm²

Step-by-step explanation:

The area (A) of a trapezoid is calculated as

A = $\frac{1}{2}$ h(a + b)

where h is the height and a, b the parallel bases

Here h = 7, a = 15 and b = 22 , thus

A = $\frac{1}{2}$ × 7 × (15 + 22)

= 0.5 × 7 × 37

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4 years ago

The following function is probability mass function. f left-parenthesis x right-parenthesis equals StartFraction 2x plus 1Over 2

lora16 [44]

Answer:

a) Mean = 2.6

B) Variance = 9.2

Step-by-step explanation:

We are given the following probability mass function in the question:

$F(x) = \dfrac{2x+1}{25}, x = 0,1,2,3,4$

a) Mean of random variable

$\mu = \displaystyle\sum x_iF(x_i)\\\\=0(\dfrac{1}{25}) + 1(\dfrac{2+1}{25}) + 2(\dfrac{4+1}{25}) + 3(\dfrac{6+1}{25}) + 4(\dfrac{8+1}{25})\\\\=\dfrac{3+10+21+36}{25} = \dfrac{70}{25} = 2.8$

b) Variance of the random variable

$\sigma^2 = \displaystyle\sum x_i^2F(x_i)\\\\=0^2(\dfrac{1}{25}) + 1^2(\dfrac{2+1}{25}) + 2^2(\dfrac{4+1}{25}) + 3^2(\dfrac{6+1}{25}) + 4^2(\dfrac{8+1}{25})\\\\=\dfrac{3+20+63+144}{25} = \dfrac{230}{25} = 9.2$

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3 years ago

Determinar él área de un rectángulo que tiene un lado mayor de 8 m y un lado menor de 7 metros

Ede4ka [16]

Answer/Respuesta: 56 metros

Formula del area de un rectángulo: b•h = Area or lado mayor x lado menor = Área

8•7 = 56
56 meters or 56 metros

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3 years ago