All categories

2 years ago

21x =7? A. x=3 B. None of these C. x=147 D. x=28

Mathematics

1 answer:

Varvara68 [4.7K]2 years ago

6 0

Answer: B

Step-by-step explanation:

To isolate x, you divide both sides by 21

21x=7

$\frac{21x}{21}=\frac{7}{21}$

x = 7/21

Simplify by dividing both the numerator and denominator by 7

x = 1/3

Since, 1/3 is not an option, B is the correct answer

You might be interested in

bryans aquarium is 6 feet long, 4 feet wide and 5 feet high, how many cubic feet of water can the tank hold?

SashulF [63]

6 x 4 x 5 = 120 cubic feet of water

7 0

3 years ago

I don’t know how to work out this word problem for my math class

Len [333]

do you mind telling me the question?

4 0

3 years ago

Read 2 more answers

800 grams is how many pounds

VashaNatasha [74]

2.2 lb is equivalent to 1 kg. Therefore,

800 grams 1 kg 2.2 lb
---------------- * ----------- * ------------ = 1.76 lb (answer)
1 1000 g 1 kg

5 0

3 years ago

According to a state law for vehicles traveling on state roads, the maximum total weight of a vehicle and its contents depends o

Alex787 [66]

Inequalities are used to show the relationship between unequal expressions.

The inequalities that represent the maximum weights are:

2 axles - $x \le 40000$ .
3 axles - $x \le 60000$ .
4 axles - $x \le 80000$ .

Let the maximum weight be represented with x

In inequality, maximum means less than or equal to i.e. $\le$

(a) 2 axles

The maximum weight, here is 40000.

So, the inequality is:

$x \le 40000$

(b) 3 axles

The maximum weight, here is 60000.

So, the inequality is:

$x \le 60000$

(c) 4 axles

The maximum weight, here is 80000.

So, the inequality is:

$x \le 80000$

See attachment for the graphs of each inequality