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Alchen [17]
3 years ago
11

21-6+3-6 order of operations??

Mathematics
1 answer:
Kazeer [188]3 years ago
8 0

Answer:

PEMDAS

they actually changed it so now its

PEM/DA/S

multiplication is interchangeable with division and so is addition and subtraction

Step-by-step explanation:

21-6=15

15+3=18

18-6=12

12 is the answer

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_16. Which expression is equivalent to
Phantasy [73]

Answer:

-2x-8

Step-by-step explanation:

1) Distribute:

-6/3x+-15/3-3

2) Simplify:

-2x-5-3

3) combine like terms:

-2x-8

hope this helps

5 0
3 years ago
Find the quotient of 3493 and 32
Nimfa-mama [501]
109.15 here's the andwer
3 0
3 years ago
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One side of a triangle is two times the second side. The third side is 5 feet longer than the second side. The perimeter of a tr
Sphinxa [80]
Second side= x
First side = 2x
Third side = x+5
x+2x+x+5=49
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3 0
2 years ago
Side's of a triangle to side of a square​
Masja [62]

Answer:

3:4

Step-by-step explanation:

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3 0
2 years ago
Read 2 more answers
a. How wide must a wall footing be if the load is 9,500 pounds per foot of wall length, and the footing rests on a sandy gravel?
Phantasy [73]

Answer:

a) 38"

b) L = 5.7'

Step-by-step explanation:

a) Given

P = 9,500 lb/ft

Thick = 18"

We assume an allowable bearing pressure of σ = 3000 lb/sf

If Stress = Force / Area

σ = P/A

Solving for area

A = P/σ  ⇒  A = 9,500 lb/ft/3000 lb/sf

⇒  A = 3.167 sf,  or  3.167 ft wide, per foot of length.

⇒  A = 38" wide

We can see the pic 1 in order to understand the answer.

b) Given

P = 65,000 pounds = 65,000 lb

Thick = 18" = 1.5'

We assume an allowable bearing pressure of σ = 2000 lb/sf

If Stress = Force / Area

σ = P/A

Solving for area

A = P/σ  ⇒  A = 65,000 lb/2000 lb/sf

⇒  A = 32.5 sf

then A = L²  ⇒  L = √A = √(32.5 sf) = 5.7 ft

Finally L = 5.7'

We can see the pic 2 in order to understand the answer.

3 0
3 years ago
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