This is the commutative property of addition. It basically says, x+y=y+x.
To answer your question, 103+21=21+103
Each book is 2.4cm thick; that means if you're stacking books on top of each other, that is, on their sides, each book will be 2.4 cm tall. multiply the length of each book (2.4cm) by 21 to figure out how tall 21 books together will be. 2.4 x 21 = 50.4. the shelf needs to be at least 50.4cm tall.
Answer:
100 inches
Step-by-step explanation:
Given that the mans height is 71 inches. Height of lamp is 108 inches and distance between them is 52 inches. For Figure refer to attachment . The given figure both triangles are similar by AA similarity Condition. So we know that the corresponding parts of similar triangles are proportional .Let Distance between man a d its shadow be x .
<u>Using</u><u> </u><u>this </u><u>concept</u><u> </u><u>,</u><u> </u>
=> AM / PN = QA / QP
=> 108 / 71 = 52 + x / x
=> 1.52 x = 52 + x
=> 1.52 x - x = 52
=> 0.52 x = 52
=> x = 52/0.52
=> x = 100 in .
Answer: choice a
Step-by-step explanation:
Set up your variables. For this question lets use x, y, and z.
the equations will be . .
x + y + z = 165
x = 2y - 65
z = y -10
If we now substitude the equations for x and z with the first equation we cans solve for y. Hence the equation will be . . .
2y - 65 + y + y -10 = 165
y = 60
then substitude the equations for x and z with y.
your answer should match choice a.
