Answer:
Step-by-step explanation:
90=(31-3x)+(19x-5)
90=31-3x+19x-590=19x-3x+31-5
90=16x+26
90-26=17x
64=4x
x=4
m∠R=19(4)-5
m∠R=76-5
m∠R=71
31-3x+19x-5=90
26+16x=90
-26 -26
--------------------
16x= 64
16x/16= 64/16
m <R=19 (4)-5= 71.
A
(x+2)(x+2)
= x^2+2x+2x+4
=x^2+4x+4
5)1075000000
6)333.333333333
5)4.3*10^3=4300
2.5*10^5=250000
6)3*10^6=3000000
9*10^3=9000