Make note of the coefficients in the first and fourth equations. They've been conveniently picked so that subtracting one equation from the other eliminates every variable but t. We have

(3r + 2s + t + 2u + 3v) - (3r + 2s + 3t + 2u + 3v) = 7 - 17

-2t = -10

t = 5

5 0

3 years ago

Carla Eppelstein is saving her babysitting money to buy a bicycle. She usually babysits a total of 11 to 16 hours per week and c

mario62 [17]

Answer:

About three weeks.

Step-by-step explanation:

147 divided by 4.50 = 32.6

32.6 divided by 11 is almost 3. So about three weeks.

4 0

3 years ago

Rick buys remote control cars to resell. He applies a markup of 21%. Enter two expressions that represent the retail price of th

11111nata11111 [884]

The two expressions that represent the retail price of cars is: Retail price = 1.21c and Retail price = c + 0.21c

Solution:

Given that,

Rick buys remote control cars to resell

He applies a markup of 21%

Let "c" be the original price of remote control cars

To find: Expression for retail price of car

We know that,

Retail price = original price + markup

Here, markup price = 21 % of original price

Markup price = 21 % of c

Therefore, substituting the given values we get,

Retail price = c + 21 % of c

$\text{ Retail price } = c + 21 \% \times c\\\\\text{ Retail price } = c + \frac{21}{100} \times c\\\\\text{ Retail price } = c + 0.21c\\\\$

This can also be expressed as,

$\text{ Retail price } = c + 0.21c = 1.21c$

Thus two expressions that represent the retail price of cars is: Retail price = 1.21c and Retail price = c + 0.21c

4 0

3 years ago