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2 years ago

Ssion 4 x (20 – 1) if a = 3? What the answer?

Mathematics

2 answers:

larisa [96]2 years ago

7 0

Answer:

Step-by-step explanation:

a = 3

4 × (2a - 1) =

= 4 × (2 × 3 - 1)

= 4 × (6 - 1)

= 4 × 5

= 20

erica [24]2 years ago

4 0

Answer:

Step-by-step explanation:

<h3>Question:</h3>

4 × 2(a - 1)

<h3>Given value:</h3>

a = 3

<h3>Solution:</h3>

4 × 2(a - 1)

= 4 × 2(3 - 1) [Substituting the value of a = 3]

= 4 × 2(2)

= 4 × 4

= 16

Hence, 16 is the required answer.

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The probability a person is infected by a certain cold virus is 0.2. If a random sample of 12 people is taken, what is the proba

inna [77]

Answer:

If 0.2 = 20%, The probability that 1 person will be infected is 100%, according to theory.

3 0

3 years ago

A polyhedron has 6 faces and 6 vertices. how many edges does it have?

MissTica

Answer:

a polygon has 3 or more sides

5 0

3 years ago

The ratio of Wei Ling's age to Wei Xuan's age 5 years ago was 2: 5. In 9 years

Archy [21]

Answer:

15 years old

Step-by-step explanation:

Start by defining the variables that we are going to use throughout our working:

Let the current age of Wei Ling and Wei Xuan be L and X years old respectively.

Next, form equations using the given information.

5 years ago

Wei Ling: (L -5) years old

Wei Xuan: (X -5) years old

Given that the ratio of Wei Ling's age to that of Wei Xuan's is 2: 5,

$\frac{ L - 5}{X - 5} = \frac{2}{5}$

Cross multiply:

2(X -5)= 5(L -5)

Expand:

2X -10= 5L -25

2X= 5L -25 +10

2X= 5L -15 -----(1)

9 years time

Wei Ling: (L +9) years old

Wei Xuan: (X +9) years old

Given that the ratio of Wei Ling's age to that of Wei Xuan is 3: 4,

$\frac{L + 9}{X + 9} = \frac{3}{4}$

Cross multiply:

3(X +9)= 4(L +9)

Expand:

3X +27= 4L +36

3X= 4L +36 -27

3X= 4L +9 -----(2)

Let's solve using the elimination method.

(1) ×3:

6X= 15L -45 -----(3)

(2) ×2:

6X= 8L +18 -----(4)

(3) -(4):

6X -6X= 15L -45 -(8L +18)

0= 15L -45 -8L -18

0= 7L -63

7L= 63

L= 63 ÷7

L= 9

Substitute L= 9 into (1):

2X= 5(9) -15

2X= 45 -15

2X= 30

X= 30 ÷2

X= 15

Thus, Wei Xuan is 15 years old now.

6 0

2 years ago

You get a student loan from the New Mexico educational assistance foundation to pay for your educational expenses this year . F

jok3333 [9.3K]

Answer:

the interest gathered on the loan is $250

Step-by-step explanation:

5% interest on $5,000 for one year would be $250

the total amount wlike be $5250 but the question seems to only ask for the interest

convert 5% to a decimal to multiply to find interest

0.05•5000 gives us the interest for the year

hope this helps <3

8 0

3 years ago

Find the value of x for the given equation : 2 (x-1) - 6 =24

olasank [31]

Answer:

x = 16

Step-by-step explanation:

2(x - 1) - 6 = 24 ( add 6 to both sides )

2(x - 1) = 30 ( divide both sides by 2 )

x - 1 = 15 ( add 1 to both sides )

x = 16

4 0

2 years ago