4 years ago

Kelly is 15 years older than frank. In 2 years time, she will be 4 times as old as him. Find their present ages

Mathematics

2 answers:

maw [93]4 years ago

6 0

Frank will be 4.25 in two years, therefor he is presently 2.25, which is 2 years and 3 months

Luba_88 [7]4 years ago

4 0

Kelly is 18 years old, Frank is 3 years old

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The area of the base of the oblique pentagonal pyramid is 50 cm^2 and the distance from the apex to the center of the pentagon i

Verdich [7]

The complete question in the attached figure

Part a)
we know that
ABC is a right triangle
∠ACB=45°
AC=hypotenuse------> 6√2 cm
sin 45=AB/AC-----> AB=AC*sin 45----> AB=6√2*√2/2----> AB=6 cm

the answer part a) is
AB=6 cm

Part b)
we know that
volume of the pyramid=(1/3)*Area of the base*height
area of the base=50 cm²
height=6 cm
so
volume of the pyramid=(1/3)*50*6----> 100 cm³

the answer part b) is
100 cm³