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azaz1819
30.07.2019 •
Mathematics
Audras parents are both in their forties. the sum of their ages is ninety -two. the product of their ages is 2,107. how old is audras oldest parent?
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Ответ:
Hello there!
Let's define x = age of parent 1, and y = age of parent 2, and suppose that y is the oldest one.
we know that:
x + y = 92
x*y = 2107
now we have a system of equations that we need to solve:
the first step is isolate one of the variables in one of the equation, let's isolate x in the first equation:
x = 92 - y
now we can replace it in the second equation and find the value of y.
x*y = 2107
y*(92 - y) = 2107
92y - y^2 = 2107
now we need to solve a cuadratic equation!
-y^2 + 92y - 2107 = 0
using the Bhaskara formula, we get:
so we have two solutions:
y = (-92 + 6)/(-3) = 43
y = (-92 - 6)/(-2) = 49
because y is the oldest one, we need to take the biggest solution, this is y = 49.
so the oldest parent has 49 years.
if you want to find the age of the other parent, replace this in the first equation:
y + x = 92
49 + x = 92
x = 92 - 49 = 43
Ответ:
The new line segment CD is 1/4 th of AB
CD = × AB
Step-by-step explanation:
Given that, RSTU is a square and AB a line drawn through it's center.
let the length of side of square be a.
⇒ Length of line segment AB = a. (as it is same as length of side of square)
Now, given the square is dilated using the scale factor of 1/4 and a line is drawn through the center of the new dilated figure.
let this line be CD with points C and D on sides of dilated square.
Now, as the square is dilated by a factor of 1/4, length of side of dilated square is a× =
⇒ the length of CD =
⇒ The new line segment CD is 1/4 th of AB
CD = × AB