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3 years ago

The product of a number and 7 is not less than 21

Mathematics

1 answer:

djverab [1.8K]3 years ago

6 0

The product of 3 and 7 is 21

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Y=x-7 y=-2x+8 solve using substitution

RUDIKE [14]

Y = x-7
+7 +7
x = y+7
- - - -
y=-2x+8
y=-2(y+7) +8
y= -2y - 14 +8
+2y +2y
3y = -6
/3 /3
y = -2
- - - -
x = y+ 7
x = -2 +7
x = 5

(5, -2)

4 0

4 years ago

PLEASE HELP!!! Two towns are 1100 miles apart. A group of hikers starts from each town and walks down the trail toward each othe

Vinvika [58]

Answer:

2.54 miles/hr

2.04 miles/hr

Step-by-step explanation:

Given: Distance between the two towns = 1100 miles

Difference between speeds = $\frac{1}{2}$ miles/hr

Total time when they meet = 240 hours

To find:

Let distance traveled by first group = $x$ miles.

Now, the distance traveled by second group = (1100- $x$ ) miles/hr

The relation between Speed, Time and Distance is given as:

$\text{Speed =} \dfrac{\text{Distance}}{\text{Time}}$

Let speed of first group = $S_1$

$S_1 = \dfrac{x}{240}$

Let speed of second group = $S_2$

$S_2 = \dfrac{1100-x}{240}$

As per question, $S_1$ = $S_2$ + $\frac{1}{2}$

$\dfrac{x}{240} = \dfrac{1100-x}{240} + \dfrac{1}{2}\\\Rightarrow \dfrac{x}{240} - \dfrac{1100-x}{240} = \dfrac{1}{2}\\\Rightarrow \dfrac{x-1100+x}{240} = \dfrac{1}{2}\\\Rightarrow 2x - 1100 = 120\\\Rightarrow 2x = 1220\\\Rightarrow x = 610 ft$

Now,

$S_1 = \dfrac{x}{240}$

Putting value of $x$ :

$S_1 = \dfrac{610}{240}\\\Rightarrow S_1 = 2.54\ miles/hr$

Similarly, putting value of $x$ in $S_2$ :

$S_2 = \dfrac{1100-610}{240}\\\Rightarrow S_2=\dfrac{490}{240}\\\Rightarrow S_2 = 2.04\ miles/hr$

8 0

3 years ago

HELP GIVEING BRAINLIST What is the solution set of -11 > 1 + a?

Alja [10]

Answer:

the solution set is -11 > 1 + a?

a > -10

a -12

a < -10

3 0

3 years ago

Read 2 more answers

joe has a handful of dimes and quarters that values to $5.30. He has one fewer than twice as many dimes than quarters. How many

OlgaM077 [116]

Answer:

12 quarters 23 dimes

Step-by-step explanation:

x(0.25)+(2x-1)(0.10)=5.30

0.25x+0.2x-0.10=5.30

0.45x=5.40

x=12

12 quarters

12(2)=24-1=23 dimes

5 0

2 years ago

Change 5 - 2 into an addition problem using a change in sign and the additive inverse.

Mademuasel [1]

9514 1404 393

Answer:

5 + (-2)

Step-by-step explanation:

starting with: 5 - 2

step 1: 5 + ( )

step 2: 5 + (-2)

5 0

3 years ago