2 years ago

Simplify the expression b - 7 + b - 8

Mathematics

1 answer:

natulia [17]2 years ago

3 0

Answer:

2b - 15

Step-by-step explanation:

b - 7 + b - 8

You combined the two b's correctly, but didn't combine the two constants, -7 and -8.

Those combine to -7 + (-8) = -7 - 8 = -15, so the final answer is

2b - 15

you have -7 and are subtracting 8 more, so you are moving 8 units left on the number line, so it has to get more negative.

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An office room is 12 ft by 10 ft with a door that is 30 inches wide. How many feet of baseboard are needed to go around the room

Lina20 [59]

Draw a diagram to illustrate the problem as shown below.
The length of baseboard needed is AB + BC + CD + DE + FE.
Note that 30 in = 30/12 ft = 2.5 ft.

Because of the door opening,
AB + EF = 12 - 2.5 = 9.5 ft
Also,
BC = DE = 10 ft
CD = 12 ft.

The amount of baseboard needed is
AB + BC + CD + DE + FE
= (AB + EF) + BC + CD + DE
= 9.5 + 10 + 12 + 10
= 41.5 ft

Answer:
41.5 feet of baseboard.