It’s time to play “what’s my number? ” the number will now tell you about “i am a 4-digit even number where the sum of my digits is half of the jersey number made famous by baseball player jackie robinson. if you take my second digit and multiply it to my last digit, the result is a two- digit number – the tens digit in this result is my third digit. my last digit is one more than my third digit and one less than my first digit. if you multiply my third digit to itself, you will get my second digit.” what’s my number?

let the number be abcd

then a + b + c + d = 21

also  we are given:-

d = c + 1

d = a - 1

c^2 = b

a - 1 = c + 1     (as they are both = d)

So c = a - 2

and b = (a - 2)^2

So substitute for b , c and d in the first equation we get

a + (a - 2)^2 + a - 2 + a - 1 = 21

a + a^2 - 4a + 4 + a - 2 + a - 1 = 21

a^2 - a - 20 = 0

(a - 5)(a + 4) = 0

So a = 5    (ignore the negative -4)

Now using the above results   d = 5 - 1 = 4

c = 5 - 2 = 3  and b = c^2 = 9

So your number is 5934  (answer)

answer set (b) 0.5, 3/4 80% is in order from least to greatest.  

step-by-step explanation:

in order to compare rational numbers to each other, it is much easier if they are in the same form.   typically, the best form in which to evaluate rational numbers is in decimals.   in order to convert a percent to a decimal, you would divide the given percentage by 100.   you can also accomplish the conversion by moving the decimal point over two places to the left.   for example, the decimal value of 80% is 80/100, or 0.8.   in order to convert a fraction to a decimal, you need to divide the numerator by the denominator.   for example, 3/4 is 0.75.   so, for choice (b) 0.5 3/4 (0.75), 80% (0.8) is the only choice in which the numbers are in order from least to greatest.