3 years ago

The ratio of Mark’s age to Reeta’s age is 3 : 5 Mark’s age is 24 years. Work out Reeta's age.

1 answer:

6 0

The ratio of Reeta's age and Site's age is 3:5 and the sum of their ages is 80 years. The ratio of their ages after 10 years will be

You might be interested in

3. People who smoke are asked to halve the number of cigarettes consumed each day so that any effect on

Elza [17]

This is an experiment.

3 0

4 years ago

Find a unit vector parallel to and normal to the graph of f(x) at the indicated point. f(x) = sqrt(25-x^2) point (3,4)

cupoosta [38]

y = sqrt(25-x^2) at point (3,4)

The derivative gives us the slope at 3 to be:
-2x
------------ at x=3: -3/4
2sqrt(25-x^2)

so we have a vector that is parallel to the slope of the tangent line is: <4,-3>

the mag = 5 so; unit tangent = <4/5 , -3/5>

since perpendicular lines have a -1 product between slopes we get the normal to be... <3/5,4/5>

It is <4,-3> because it is rise over run. Rise is y component of vector and run is x component of vector.

4 0

3 years ago

Identify each expression and value that represents the area under the curve y=x^2+4 on the interval [-3,2]

Alina [70]

The area under a graph is given by the integral of that function, evaluated in the interval of interest:

$\displaystyle \int_{-3}^2 x^2+4\;dx = \left[\dfrac{x^3}{3}+4x\right]_{-3}^2 = \left[\dfrac{2^3}{3}+4\cdot 2\right]-\left[\dfrac{(-3)^3}{3}+4\cdot(-3)\right] = \left[\dfrac{8}{3}+8\right]-\left[-9-12\right] = \dfrac{32}{3}+21 = \dfrac{95}{3}$