Coal is used in the making of _____< Select all that apply

Mathematics

1 answer:

Bas_tet [7]3 years ago

6 0

I know for sure that coal is used to make plastic but im not sure about the rest... :/ hope this helped a little

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Nata [24]

Answer: 15, -8

Step-by-step explanation:

$u_2=7\\u_2=u_1+r\\u_3=u_1+2r\\u_4=u_1+3r\\\\u_1+u_2+u_3+u_4=4u_1+6r=12\\u_1+r=7\\\\$

$\left \{ \begin {array} {ccc|c|c}u_1+r&=&7&-4&-6\\4u_1+6r&=&12&1&1\\\end {array} \right.\\\\\\\left \{ \begin {array} {ccc}2r&=&-16\\-2u_1&=&-30\\\end {array} \right.\\\\\\\left \{ \begin {array} {ccc}r&=&-8\\u_1&=&15\\\end {array} \right.\\\\\\Proof:\\u_1=15\\u_2=7\\u_3=-1\\u_4=-9\\sum=12\\$

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2 years ago

X is all the following except<br> a term<br> a variable<br> a constant<br> an expression

lisov135 [29]

Answer: a constant

Step-by-step explanation:

A constant is a numerical expression like 2, 0,78 etc .

A variable is a alphabetical expression that vary like a,b,c,d,x,y,z.

An expression can consists of both numerical and alphabets and also any arithmetic expression like x, 2abc, 6a+2c etc

A term consist of either numbers and variables multiplied together or only numbers or variable like 2xy, x, 2ab etc.

X is all (a term, a variable , an expression) except a constant because a constant is a numerical expression.

6 0

3 years ago

If d = the number of dogs, which variable expression represents the phrase below? the sum of the number of dogs and the 6 cats A

Naya [18.7K]

Hello! :)

The sum of the number of dogs and cats.

Cats= 6

Dogs= d

It is asking for the sum. (the number added together)

d+6 or "C" is the correct answer.

~'Manda

5 0

3 years ago

Read 2 more answers

a train travels 120 miles in 1 1/2 hours. At this rate how many miles will the train travel in 6 hours

Morgarella [4.7K]

Answer:

480 miles

Step-by-step explanation:

120/1.5=80

80*6=480

6 0

3 years ago