When Janice is 20 years old; her brother is half her age. When Janice is 30 years old; how old is her brother?
2 answers:
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Answer:
see below
Step-by-step explanation:
The overbar on decimal digits means they repeat forever.
Any fraction with a denominator consisting of powers of 2 and/or 5 will terminate. These can be converted to decimal by multiplying the fraction by a number to make the denominator an appropriate power of ten.
1 2/3 = 1.66666666666... repeating
1 3/5 = 1 (3·2)/(5·2) = 1 6/10 = 1.6
1 1/4 = 1 (1·25)/(4·25) = 1 25/100 = 1.25
1 33/50 = 1 (33·2)/(50·2) = 1 66/100 = 1.66
Of course, your calculator can tell you the decimal equivalents, too.
Answer:
Part 22) The area is and the perimeter is
Part 24) The area is and the perimeter is
Part 26) The area is equal to
Step-by-step explanation:
Part 22) Find the perimeter and area
step 1
The area of a rectangle is equal to
we have
Remember that
When multiply exponents with the same base, adds the exponents and maintain the base
substitute in the formula
step 2
The perimeter of a rectangle is equal to
we have
substitute in the formula
Part 24) Find the perimeter and area
step 1
The area of triangle is equal to
where
Remember that
When multiply exponents with the same base, adds the exponents and maintain the base
substitute the given values
step 2
Find the perimeter
I will assume that is an equilateral triangle (has three equal length sides)
The perimeter of an equilateral triangle is
where
substitute
Part 26) Find the area
The area of a circle is equal to
where
Remember the property
substitute in the formula the given value