3 years ago

Express using algebra. Jane is 3 years older than Mary, and Mary is twice as old as Kay. If Kay is x years old, how old is Jane?

Mathematics

1 answer:

krok68 [10]3 years ago

5 0

Kay = x

Mary is twice as old as Kay
⇒ Mary = 2x

Jane is 3 years older than Mary
⇒ Jane = 2x + 3

Answer: 2x + 3

You might be interested in

Describe what a graph with infinitely solutions look like

never [62]

A graph with y = 2x + 1 is an example of one

8 0

3 years ago

"How are straight angles different from right angles?" Is this a statement? <br> yes or no

Arturiano [62]

No, this is a question.

7 0

3 years ago

Finish the value of d 2d - 5 = 17

Mkey [24]

D is 11

2d - 5 = 17 add 5 to both sides

2d = 22 divide by 2

d = 11 answer

8 0

3 years ago

2. You deposit $1200 into a bank account. Every year that accounts increase by 15 %.

lord [1]

Answer:

Exponential Growth, 1200(1.15)

Step-by-step explanation:

It is a Growth function because it is "increasing" yearly. The equation is multiplying with 1.15 because when it is increasing, you need to add 1 to the percentage rate.

7 0

3 years ago

How would i solve this problem using log base 10

Archy [21]

First isolate the power of 10 on the right side by dividing both sides by 5:

$100=5\cdot10^{0.3t}\implies20=10^{0.3t}$

Now you're free to take the logarithm and simplify where you can:

$\log_{10}20=\log_{10}10^{0.3t}=0.3t\log_{10}10=0.3t$

Then solve for $t$ :

$t=\dfrac{\log_{10}20}{0.3}\approx4.34$

8 0

3 years ago