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Alenkinab [10]
3 years ago
14

BRAINLIEST BRAINLIEST BRAINLIEST PLEASE ANDSER IT IS TIMED THANK YOU SO MUCCH

Mathematics
1 answer:
Doss [256]3 years ago
8 0

Answer:

x=-b/2a

Step-by-step explanation:

hope that helps :)

mark as brainliest please :)

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Simita has 25 coins, consisting of 10c and 5c, which total $2.25. how many of each does she have?​
Ilya [14]

Answer:

10c = 20

5c = 5

Step-by-step explanation:

Let x be the number of 10c coins; let y be the number of 5c coins. The total is $2.25, so the amount of 10c and 5c coins will add to that. Simita has 25 coins, so x and y, the number of coins, will have to add to 25. Hence, solve the simultaneous equation.

10x + 5y = 225 (1) - times by 0

x + y = 25 (2) - times by 5

10x + 5y = 225 (1)

5x + 5y = 125 (2)

Then, take equation 2 away from equation 1.

5x = 100

x = 20

Substitute x back into the original equation.

x + y = 25

20 + y = 25

y = 5

7 0
3 years ago
z scores are useful because they:a. allow us to convert raw scores to mean scores, compare scores from different samples, and tr
Alla [95]

Answer:

they give us a sense of where a score falls in relation to the mean of its population (in terms of standard deviation of its population), 2) they allow us to compare scores from different distributions, and 3) they can be transformed into percentiles.

Step-by-step explanation:

3 0
3 years ago
The schematic of a rectangular patio is drawn 1/4 inch to 1 feet. if the patio is 18 feet long, what is the measure of the patio
Aleksandr-060686 [28]
Try 4.5 inches. You take 18, divide it by four you get 4.5. I divided by 4 because of the 1/4 inch by 1 foot. Minus 2 from 18, you get the next closest dividend of 4 and that's 16. 16 divided by 4 is 4. 2 are left over to make .5. you get 4.5
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3 years ago
What is the first step in solving this equation? 3(2x+6)-4x 2(5x- 2) +6 Use the subtraction property of equality to subtract 6 f
LekaFEV [45]

Answer:

Use the distributive property on each side of the equation.​

Explanation:

PEMDAS

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How many days are in 37 000 minutes?
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Answer:

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