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IRISSAK [1]
3 years ago
8

5(x+7)+2(y-1)when x=7 and y=2

Mathematics
2 answers:
d1i1m1o1n [39]3 years ago
8 0

Answer:72

Step-by-step explanation:5(7+7)+2(2-1)

brackets first=7+7=14

2-1=1

5(14)+2(1)

times the brackets by the numbers on the outside

5x14=70

2x1=2

add the too together

70+2=72

balu736 [363]3 years ago
5 0

Answer: 72

Step-by-step explanation:

First plug in 7 for x

5(14)

Then multiply

70

Next plug 2 in for y

2(1)

Multiply

2

Lastly, add 70 and 2 together.

72.

Hope this helps.

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The circumference of the base of a cylinder is 24π mm. A similar cylinder has a base with circumference of 60π mm. The lateral a
earnstyle [38]
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The value of x from the equation is, 
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6 0
3 years ago
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A regression of y = calcium content (g/L) on x = dissolved material (mg/cm2) was reported in the article "Use of Fly Ash or Sili
MatroZZZ [7]

Answer:

a) The slope = 0.144 , means that an increase in dissolved material by 1 mg/cm^2 will lead to an increase in Calcium content by 0.144 g/l

while the coefficient of determination = 0.869 , means that 86% of the variation ( natural ) of calcium content is explainable using the Linear model.

b) 10.878

c) S ≈ 1.99

Step-by-step explanation:

a) The slope = 0.144 , means that an increase in dissolved material by 1 mg/cm^2 will lead to an increase in Calcium content by 0.144 g/l

while the coefficient of determination = 0.869 , means that 86% of the variation ( natural ) of calcium content is explainable using the Linear model.

<u>B) Point estimate of true average calcium content </u>

Given that dissolved material = 50 mg/cm^2

= 3.678 + 0.144 * dissolved material

=  3.678 + 7.2 =  10.878

<u>C) Determine an estimate of error standard deviation </u>

Given that ; sum of squares ( SST ) = 320.398

                   COD ( r )  = 0.86

first;  calculate the value of SSE = SST - SST ( r^2 )

SSE = 320.398 - 320.398 ( 0.86) ^2

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Finally ; determine the estimate of error standard deviation

S^2 = SSE / n -2

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∴ S ≈ 1.99

6 0
3 years ago
Layla has 30 pairs of shoes in her closet 10% white 30% black 40% are brown and the rest are bright colored how many pairs are b
Liula [17]

Answer:

6

Step-by-step explanation:

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8 0
3 years ago
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If vector u = &lt;-3.5, -1.5&gt; and vector v = &lt;-1.25, 2.25&gt;, which graph shows the resulting vector for 2v − u?
Sedaia [141]

Answer:

D

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We know that vector addition is scalar addition.

Given vectors are u = <-3.5, -1.5> and v = <-1.25, 2.25>

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8 0
3 years ago
What is the volume, in cubic in, of a rectangular prism with a height of 8in, a width of 5in, and a length of 9in?
Maslowich

Answer:

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Step-by-step explanation:

The volume is given by

V = l*w*h

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3 0
3 years ago
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