(perimeter of a rectangle) 2w + 2l
l = 2w + 3 (length is 3 more than twice the width)P = 78 Plug in the variable values:78 = 2(2w + 3) + 2w78 = 4w + 6 + 2w78 = 6w + 670= 6w 11.6= w
Answer:
7 hr * 12 days = 84 hours
10*84 = 840 man-hrs to build the wall
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14 men * 8 hr = 112 man-hrs/day
840/112 = 7.5 days
Step-by-step explanation:
Answer: choice B, 40.5 degrees
The triangle is isosceles based on the fact that AC = BC (the tick marks are the same). The angles opposite the congruent sides are also congruent
angle A = angle B = x for some unknown number x
The three angles A,B,C add to 180, so,
A+B+C = 180
x+x+99 = 180
2x+99 = 180
2x = 180-99
2x = 81
x = 81/2
x = 40.5
So angle A and angle B are both 40.5 degrees
Check:
A+B+C = 180
40.5+40.5+99 = 180
180 = 180 answer is confirmed
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Edit
The sides with the two tick marks are the same length, so 7x-4 is the same as length as 31
7x-4 = 31
7x = 31+4
7x = 35
x = 35/7
x = 5
Answer is choice B) 5
It will be 7 years 6 months with $25 extra
Five. nine thousand and sixteen
