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3 years ago

14(a + 2) = 168 find a

Mathematics

1 answer:

valkas [14]3 years ago

8 0

$\bold\red{Answer:}$

14a+28=168

14a=140

a=10

hope it helps

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Write an expression for the sequence of operations. Add 3 to x, double what you have, then subtract 1 from the result

galina1969 [7]

Answer:

[2(x+3)]-1

Step-by-step explanation:

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3 years ago

Martha has $180. She needs a total of $2,000 to start investing in stocks. She earns $60 per day working, of which she saves $50

DIA [1.3K]

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3 years ago

The recipe for potato salad calls for one teaspoon of vinegar for every 2 teaspoons of mayo how many teaspoons of vinegar are ne

lozanna [386]

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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

−t=9(t−10) what is t

Luda [366]

Answer:

t = 9

Step-by-step explanation:

-t = 9(t - 10)

First, distribute the 9.

-t = 9t - 90

Next, add subtract 9t from both sides.

(-t) - 9t = (9t - 90) - 9t

-10t = -90

Divide both sides by -10. When you divide a negative by another negative, they cancel each other out.

(-10t)/-10 = (-90)/(-10)

t = 9

7 0

3 years ago