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2 years ago

a boy is 26 years younger than his father in 3 years time his age will be one third his father's age. Find the boy's present age

Mathematics

2 answers:

mr_godi [17]2 years ago

7 0

61 years old sjisjdjdjdhdddidojeheieiejejd

larisa [96]2 years ago

3 0

Answer:

61 years old

Step-by-step explanation:

26 plus 3 is 29 and 29 times 3 is 87 and 87 minus 29 is 61

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quester [9]

The sum of all angles in a triangle sum up to 180.

∠1 = x+37

∠2=x+67

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Automobile racing, high-performance driving schools, and driver education programs run by automobile clubs continue to grow in p

yuradex [85]

Answer:

Step-by-step explanation:

Hello!

Given the variables

X₁: Weight of a safety helmet for racers

X₂: Price of a safety helmet for racers

Note, there is n= 17 observed values for each variable so for all calculations I'll use this number and disregard the 18 mentioned in the text.

a) Scatterplot in attachment.

b) If you look at the diagram it seems that there is a negative linear regression between the price and the weight of the helmets, meaning, the higher the helmet weights, the less it costs.

c) The estimated regression equation is ^Yi= a + bXi

n= 17; ∑Y= 6466; ∑Y²= 3063392; ∑X= 1008; ∑X²= 60294; ∑XY= 367536

Y[bar]= 380.35; X[bar]= 59.29

$b= \frac{sumXY-\frac{(sumX)(sumY)}{n} }{sumX^2-\frac{(sumX)^2}{n} } = \frac{367536-\frac{1008*6466}{17} }{60294-\frac{(1008)^2}{17} } = -30.18$

$a= Y[bar]- bX[bar]= 380.35-(-30.18)*59.29= 2169.77$

The estimated regression equation for the price of the helmets as a function of their weight is:

^Yi= 2169.77 -30.18Xi

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3 years ago