A sequence of patterns uses grey squares and white squares here are the first four patterns workout the total number of squares in pattern 100 3 marks

100

Step-by-step explanation:

if pattern 1 has 1 shade, pattern 2 has 2 shades, pattern 3 has 3 shades, and so on... therefore, pattern 100 has 100 shades of grey.

89

step-by-step explanation:

13

step-by-step explanation:

169-1=168

168-3=165

165-5=160

160-7=153

153-9=144

144-11=133

133-13=120

120-15=105

105-17=88

88-19=69

69-21=48

48-23=25

25-25=0

since it took 13times to completely subtract it hence its square root is 13