Answer:
w = 3.5
Step-by-step explanation:
60cm × w = 210 CM2
60cm * w = 210cm2
÷60. ÷60
60×w=210
w=210÷60
w=3.5
it is rearranging the formula base×width=area
w=8
w+p+l = 35
=8\35 =0.228
the third one
add 2y and 16 to both sides. then divide by 2