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3 years ago

Pls help. Evaluate the expression 3.14(a2 + ab) when a = 3 and b = 4. (Input decimals only, such as 12.71, as the answer.)

Mathematics

1 answer:

givi [52]3 years ago

4 0

3.14(3(2) + 3(4))
3.14( 6 + 12)
3.14(18)
=56.52

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Michael can buy 4 sandwiches and 3 cups of coffee for $23.75. Amy can buy 2 sandwhiches and 5 cups of coffee for $19.75 how much

Kobotan [32]

Answer: The cost of one sandwich is $4.25 and the cost of one cup of coffee is $2.25.

Step-by-step explanation:

Let x be the cost of one sandwich and y be the cost of one cup of coffee.

By considering the given situation, we have the following equations :-

$4x+3y=23.75.................(1)\\\\2x+5y=19.75................(2)$

Multiply 2 on both sides of equation (2) , we get

$4x+10y=39.5................(3)$

Subtract equation (1) from equation (3), we get

$7y=15.75\\\\\Rightarrow\ y=\dfrac{15.75}{7}=2.25$

Put value of y in (1), we get

$4x+3(2.25)=23.75\\\\\Rightarrow\ 4x+6.75=23.75\\\\\Rightarrow\ 4x =17\\\\\Rightarrow\ x=4.25$

Hence, the cost of one sandwich is $4.25 and the cost of one cup of coffee is $2.25.

8 0

2 years ago

(b) Carlos removed 56 fish from his pond over a period of 7 days. He removed the same number

Pavlova-9 [17]

Well supposing that you want all fish gone -

The answer would be 8

56 (divided) 7 = 8
Day 1 - 48
Day 2 - 40
Day 3 - 32
Day 4 - 24
Day 5 - 16
Day 6 - 8
Day 7 - 0

Hope this was what you were looking for :)

6 0

2 years ago

Ya'll I'm desperate please answer this I really need to get it right.

IceJOKER [234]

Answer:

a. Indep. = x, and dependent equals f(x)

b. x impacts f(x)

f(-4)= -11

Step-by-step explanation:

hope this helped

4 0

2 years ago

Me need a lot of help

miv72 [106K]

D.) 82.45
I hope you have a good day!

7 0

2 years ago

There are 15 circles and 12 squares. What is the simplest ratio of squares to total shapes?

Viktor [21]

4:5
They both divide by 3 so 12 divided by 3 is 4 and 15 divided by 3 is 5

8 0

3 years ago