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amid [387]
4 years ago
7

Evaluate the expression 2x-7 for x = -4

Mathematics
1 answer:
Vaselesa [24]4 years ago
5 0

Answer:

-15

Step-by-step explanation:

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According to one economic model, the demand for gasoline is a linear function of price. If the price of gasoline is p # $3.10 pe
Agata [3.3K]
Your first line calculation is already true but reversed. The demand will decrease (that mean the formula would be minus) by 20 gallons for every $0.4 price increase, which means 50 gallons/$. To find the formula you need to insert one sample of either the first equation (65gallon and $3.1) or 2nd equation (45 gallons and $3.5). The formula for demand should be:

q= C - 50p
65 gallon= C- 3.1 * 50 
C= 65 gallon + 155 gallon= 220 gallon

The formula would be:
q= 220- 50p

So the second question can be solved by putting 0 on the Q. It would be:
q= 220- 50p
0=220-50p
50p=220
p= $4.4
6 0
4 years ago
A culture started with 2,000 bacteria. After 2
Ket [755]

Answer: In 10 hours, 4000 bacteria will be present.

Step-by-step explanation:

Given that 2000 bacteria grew to 2400 in 2 hours,

growth/ increase rate = 2400 - 2000

= 400 bacteria increase in 2 hours

Per hour is therefore 400/2 = 200 bacteria increase per hour

If the bacteria increases by 200 per hour

If 200 = 1 hour

X = 10 hours

We cross multiply:

X = 200 x 10

X = 2000

Therefore, a culture with 2000 bacteria at the same growth rate will have increased by additional 2000 in 10 hours

So, after 10 hours, number of bacteria will be 2000 + 2000 = 4000 bacteria

3 0
4 years ago
Which pairs of ratios form a proportion? Choose all that apply.
vekshin1
B and C are both the correct answers.
7 0
4 years ago
Read 2 more answers
Trevon is making payments on a computer that costs $1548. If he makes 12 equal payments, how much is three of his payments?
sammy [17]

Answer:

The answer is 387. Let's see why.

Step-by-step explanation:

The computer costs $1548. And all the 12 payments are <u>equal.</u>

To find one payment we need to divide the total cost to the number of payments.

\frac{1548}{12} = 129

Each one of the payments is $129.

To find three payment we simply follow:

129 . 3 = <u>387</u>

Another solution can be;

Since we are looking for 3 of the payments we can divide it to the total payment

\frac{3}{12} which equals to \frac{1}{4}

And we can find the answer by multiplying it with the cost which gives;

\frac{1}{4} . 1548 =387

4 0
3 years ago
A seven sided polygon with angle measures x, x minus 15, 107, x plus 7, 125, 122, and 131 degrees.
skad [1K]

Answer:

x = 150

Step-by-step explanation:

x + x - 15 + 107 + x + 7 + 125 + 122 + 131 = 630

3x + 180 = 630

3x = 450

x = 150

5 0
3 years ago
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