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3 years ago

One increased by the difference between 18 and seven times a number is -9

Mathematics

1 answer:

weqwewe [10]3 years ago

6 0

Answer:

(18-7x) +1 = -9

Step-by-step explanation:

the difference between 18 and seven times a number. First seven times a number is equal to 7x. Difference means subtract, so you get 18-7x. Now one increased is +1. But we have to put 18-7x into parentheses because if we dont, 18-7x+1, simplifes into 19-7x

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Point Q is plotted on the coordinate grid. Point P is at (10, −20). Point R is vertically above point Q. It is at the same dista

bixtya [17]

Answer:

Point R is at (−20, 10), a distance of 30 units from point Q

Step-by-step explanation:

Q has coordinates (-20,-20).

P has coordinates (10,-20)

Since point R is vertically above point Q, it will have the same x-coordinate as Q.

Let R have coordinates (-20,y).

It was given that;

$|RQ|=|PQ|$

$\Rightarrow |y--20|=|10--20|$

$\Rightarrow y+20=10+20$

$\Rightarrow y=10+20-20$

$\Rightarrow y=10$ .

The coordinates of R are (-20,10).

The dstance from Q is 30 units.

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3 years ago

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A plane flies 3115.8 miles in 7.2 hours. What is its average speed? (Speed =

Tatiana [17]

Average speed = total distances / total time

3115.8 / 7.2 = 432.75 mi/h

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3 years ago

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Find a + b, if b^a = 64 and a^b = 81

jeyben [28]

$\bf \begin{array}{llll}
b^a=64\qquad \boxed{64=4^3}\qquad b^a=4^3
\\\\\\
a^b=81\qquad \boxed{81=3^4}\qquad a^b=3^4
\end{array} \qquad 
\begin{cases}
a=3\\
b=4
\end{cases}
\\\\\\
a+b\implies 3+4$

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3 years ago

I will mark u brainlist if u answer find the mistake... 4x + x = 30 –6 4x = 24 4 24 4 4 x x = 6

Jlenok [28]

Answer:

The mistake is that 4x+x = 5x not 4x

Step-by-step explanation:

4x + x = 30 –6

Combine like terms

5x = 24

Divide each side by 5

5x/5 = 24/5

x = 24/5

The mistake is that 4x+x = 5x not 4x

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3 years ago

Sarina throws a ball up into the air, and it falls on the ground nearby. The ball's height, in feet, is modeled by the function

tangare [24]

Answer:

Step-by-step explanation:

We have a function of f(x) here. When Sarina throws the ball, it has been 0 seconds since she threw it.

Since x represents the amount of seconds, we can find the height of the ball (f(x)) by substituting x in as 0.

$-0^2 - 0 + 3$

0 squared is 0, 0 minus zero is 0, and 0+3 = 3, so

$f(x) = 3$

Meaning that when Sarina threw the ball, it's height was 3 feet.

Hope this helped!

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3 years ago