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Scilla [17]
2 years ago
12

Help please

Mathematics
1 answer:
ddd [48]2 years ago
7 0

Answer:

  • B. When the peak temperature is 40°C, 72 units of electricity are used on average.

Step-by-step explanation:

We see the relationship is closer to linear in the interval 30 to 40

<u>Approximate points:</u>

  • (30, 34) and (34, 54)

<u>The slope of the line:</u>

  • m = (54 - 34)/(34- 30) = 20/4 = 5

<u>The line is:</u>

  • y - 34 = 5(x - 30)
  • y = 5x - 116

<u>At x = 40, the value of y would be:</u>

  • y = 5*40 - 116 = 84

The closet option is B

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If x^2+25y^2=416 and x-5y=-16 the value of xy is <br><br> a)16<br> b)8<br> c)-8<br> d)-16
pshichka [43]

Answer:

(a)

Step-by-step explanation:

Note the expansion of (x - 5y)² is

(x - 5y)² = x² - 10xy + 25y² , that is

(x - 5y)² = x² + 25y² - 10xy ← substitute given values

(- 16)² = 416 - 10xy

256 = 416 - 10xy ( subtract 416 from both sides )

- 160 = - 10xy ( divide both sides by - 10 )

xy = 16 → (a)

3 0
3 years ago
Use intercepts to graph the line described by the equation 5x − 5y = 10.
Paraphin [41]
I hope this is the correct answer, here u go !

8 0
3 years ago
The price of a gallon of gas was $3.23 one week and $3.15 the next. What is the percent of decrease for the price of a gallon of
babymother [125]
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7 0
3 years ago
Which expression is the same as (2a + b)3?
user100 [1]

Answer:

I guess it's A

Step-by-step explanation:

2*2*2+b*b*b

that's 8a³+b³

8 0
3 years ago
the population of a town is 1,03.500 if 56%of the population is male find the number of females in the town
bija089 [108]
The population you gave isn't formatted correctly so I'll solve the problem assuming you mean 103,500.

First we find the number of males from the percentage given:

0.56 * 103500 = 57960 males

Subtract the number of males from the total population to get the number of females:

103500 - 57960 = 45540 females

You could solve the problem by finding the percentage of females first. Since there are 56% males, that means there are 100-56 = 44% females.

0.44 * 103500 = 45540

The answer is 45540.




8 0
3 years ago
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