Question 926799

Let the number be 10t+u
--------------------
19. the tens digit of a number is six more than the ones digit. write the algebraic expression for the number.
t = u + 6
# = 10(u+6)+u = 11u + 60
------------------------------
 20. the units digit of a number is four less than the tens digit. (algebraic expression)
u = t-4
# = 10t + t-4 = 9t-4
------------------------------
 21. the length of a rectangle is half of 5 times the width. write the expression for the perimeter of the rectangleth
P = 2(length + width)
P = 2((1/2)5w+w) = 5w+2w = 7w
----------------------
 22. the longer base of a trapezoid is 3 more than twice the shorter base. write an expressio for the sum of the bases.
b1 = 2*b2 + 3
Sum + b2 + 2b2+3 = 3b2+3
-------------
Cheers,
Stan H.
----------------