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3 years ago

3(x + 4) = 7x - 18 How do I solve it?

Mathematics

1 answer:

aev [14]3 years ago

3 0

Answer:

x = 7.5

Step-by-step explanation:

Step 1:

3 ( x + 4 ) = 7x - 18 Equation

Step 2:

3x + 12 = 7x - 18 Multiply

Step 3:

12 = 4x - 18 Subtract 3x on both sides

Step 4:

30 = 4x Add 18 on both sides

Step 5:

x = 30 ÷ 4 Divide

Answer:

x = 7.5

Hope This Helps :)

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Serjik [45]

Answer:

6.70m/s

Step-by-step explanation:

Speed = distance/time

Given the winner covered a distance of 26m in time of 3.88 seconds

Therefore

Speed = 26/3.88

= 6.70m/s

7 0

3 years ago

Yao Xin puts 3/10 liters of potting soil in each pot for planting flowers. She has 17/3 liters of potting soil. How many pots ca

kari74 [83]

For this case defining variables we have:

x: total amount of liters of potting soil.

y: number of liters of potting soil in each pot.

We have then to find the number of pots we use the following expression:

$N = \frac{x}{y}$

Substituting values we have:

$N = \frac{\frac{17}{3}}{\frac{3}{10}}$

Rewriting we have:

$N = \frac{170}{9}$

$N = 18.8$

Rounding to the previous whole we have:

$N = 18$

Answer:

Yao Xin can fill 18 pots

4 0

3 years ago

What is the domain of the function below?

amm1812

$f(x)=\log(x-4)+4\\\\The\ domain:\\\\x-4 > 0\qquad\text{add 4 to both sides}\\\\x > 4\\\\Answer:\ \boxed{x > 4\to x\in(4,\ \infty)}\to\boxed{D.}$

8 0

2 years ago

Read 2 more answers

Which ordered pairs are on the line with equation y−0.75=1.25(x−3)?

Sergeeva-Olga [200]

The answer is Option D. (4,2)

in this type of question , you just need to input the (x,y) , and see if the amount is correct

y - 0.75 = 1.25 (x-3)

2 - 0.75 = 1.25 ( 4 - 3)

1.25 = 1.25 (1)

1.25 = 1.25

hope this helps

6 0

2 years ago

Math question please help<br> If you get this right I will mark you as a brainliest

Phoenix [80]

That's an easy parallelogram, parallel to the x axis. Let's label the points

A(-4,-1),B(-2,4),C(4,4),D(2,-1)

AD and BC are the sides parallel to the x axis. We'll call those the base, it has length 4 - -2 = 6.

The height is the change in y between the bases, so 4 - -1 = 5.

The area is base times height, 6 × 5 = 30

Answer: 30

The shoelace formula gives us the area of a polygon from 2D coordinates without worrying about the shape:

(-4,-1),(-2,4),(4,4),(2,-1)

(-2,4),(4,4),(2,-1),(-4,-1)

$A = \frac 1 2 | -4(4) - (-1)(-2) + (-2)(4) - 4(4) + 4(-1) - 4(2) + 2(-1) - (-1)(-4) |$

$A = \frac 1 2 |-60| = 30 \quad \checkmark$

4 0

2 years ago