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Juli2301 [7.4K]
3 years ago
10

-3(n + 4)= 9 what solution is n

Mathematics
1 answer:
Lelechka [254]3 years ago
6 0

Answer:

-7

Step-by-step explanation:

- 3(n + 4) = 9 \\  \\  - 3n - 12 = 9 \\  \\  - 3n = 12 + 9 \\  \\  - 3n = 21 \\  \\ n =  \frac{ - 21}{3}  \\  \\ n =  - 7

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What is the missing number in the pattern above? 12,84,588,___,28,812
lara31 [8.8K]

Answer:

4,116

Step-by-step explanation:

Multiply by 7

12x7=84

84x7=588

and 588x7=4,116

So there's your answer 4,116

8 0
2 years ago
Sylvia, John, and Peter invested their savings in a bank. The ratio of the investment of Sylvia's to John's is 1: 3 and that of
Nastasia [14]

Answer:

4 : 12 : 15

Step-by-step explanation:

S : J = 1 : 3

J : P= 4 : 5

Using John's ratio to find a common ratio for all

S : J

(1 : 3)4 = 4 : 12

J : P

(4 : 5)3 = 12 : 15

Therefore our ratio is

S : J : P

4 : 12 : 15

3 0
2 years ago
Joe bikes at the speed of 30 km/h from his home toward his work. If Joe's wife leaves home 5 mins later by car, how fast should
Dahasolnce [82]

Answer:

45 mph

Step-by-step explanation:

This is a really good question to know the answer to. It is tricky and a bit indirect (which means you have to find something else before you can find the speed of the car.)

Let's keep track of what he does in the time allotted.

How far does Joe go in 5 minutes? That's the amount of time he's on the road before she is.

convert 5 minutes into hours. 5 minutes * 1 hour / 60 minutes = 1/12 of an hour

d = r*t

r = 30 km/hour

t = 1/12 hour

d = 30 km/hr * 1/12 hour = 2.5 km

Now she's about to start. She wants to catch him in 10 minutes

d = r*t

r = x mph

t = 10 minutes = 10 minutes * 1 hour * 60 minutes = 1/6 of an hour.

How far does he go in the 10 minute time?

d = 30 * 1/6 = 5 km

What is his total distance

5 km + 2.5 km = 7.5 km

Finally how fast does she need to go to catch him

d = 7.5 km

r = ?   This is what you are trying to find

t = 1/6 of an hour

d = r*t

7.5 km = r * (1/6)hour             divide by 1/6 hour

7.5 km // 1/6 hour = r

r = 7.5 * 6 = 45 mph

6 0
3 years ago
Prove or disprove: (a) there are positive real numbers x and y with √ x + y = √ x+ √y
ArbitrLikvidat [17]
An example would be x = 2 and y = 1:-

√2 + 1 = √2 + √1

because √1 = 1
8 0
3 years ago
Jude charges $45 per hour to install a door frame and uses $16 of wood. The
dem82 [27]

Answer:

he took 45 and he boought a dor frame

5 0
3 years ago
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