Can someone please help me with one of these problems? If you can do both, it'd be even better. Thanks!

Answer: -15

Step-by-step explanation: 2r+8-r=-7

1r +8 = -7

1/1       -15/1

Answer: r = -15

Step-by-step explanation:

2r - r = -7 -8

r = -15

Answer:

number of photos: 8, 12, 20, 28, 40

time (minutes): 2, 3, 5, 7, 10

Step-by-step explanation:

Answer:

3

Step-by-step explanation:

Answer:  The correct answer is:  " 11 .1 " .

________

Step-by-step explanation:

Given:

" [tex]1.9h + 3.5 =[/tex] ? " ;  Solve:  when: " [tex]h = 4[/tex] " ;

________

To find the answer:

We plug in "4" for the value for " [tex]h[/tex] " ;

and performed the mathematical operations indicated.

________

 →   " [tex]1.9h + 3.5 =[/tex] [tex](1.9*4) + 3.5 = 7.6 +3.5 = 11.1[/tex] " .

________

The correct answer is:  " 11 .1 " .

________

Hope this is helpful to you!

 Best wishes!

________

Answer:

X=12.75

Y=12

Step-by-step explanation:

4X+8°+31°=90°

4X=90-39/4°

X=12.75°

3Y+86=8Y+26

86-26=8Y-3Y

60=5Y

Y=60/5

Y=12

Answer:

x = 12.75

y = 12

Step-by-step explanation:

To solve for x, we can see that it makes up a right angle when placed next to the 31 degrees.

We also know that the corner should equal 90 degrees, so we can set this up:

4x+8+31=90

Group like terms:

4x=51

Divide:

x=12.75

To solve for y, we can see that two expressions equal the same length, so:

8y+26=3y+86

Group like terms:

5y=60

y=12

You can also plug in x and y in to see if they match up

4(12.75)+8+31=90

51+8+31=90

90=90

and

8(12)+26=3(12)+86

96+26=36+86

122=122

Answer:

d

Step-by-step explanation:

Answer:

7 of the kids in your class play

Step-by-step explanation:

Hope this helps you :)

Answer:

QS, RT

Step-by-step explanation:

All you had to do was know what congruent means and count how many marks are between w and y (it was 5), and then find the letters that also are exactly 5 markers apart.

The slope of the line is m = -3

The y-intercept is (0,5)

The equation of the line in the slope-intercept form is y = 5-3x

Answer:

the answer is 21.8

Substitute the value of the variable into the equation and simplify.

Answer:

She is paid $6.25.hour at the concession and $8.50 as a lifeguard.

Step-by-step explanation:

We know:

18 hours as a lifeguard

12 hours at concession

Total earned = $228

18L + 12C = 228

Then:

24 hours as a lifeguard

8 hours at concession

Total earned = $254

24L + 8C = 254

Move one equation around to get one variable by itself: in this case we can solve for L:

18L + 12C = 228

18L = 228 - 12C

L = (228/18) - (12/18)C

Plug in for L:

24((228/18) - (12/18)C) + 8C = 254

Solve for C:

C = 6.25

Now that we know C, plug in value for C and solve for L:

18L + 12(6.25) = 228

L = 8.5

So she is paid $6.25.hour at the concession and $8.50 as a lifeguard.

orthodox iridium procuring

Answer:

1) 62.5

2) 50

3) 75

4) 100

Step-by-step explanation:

1)

Because it has a half-life of 25 days, half of it will decay after 25 days.

After [tex]25*4=100[/tex] days, there will be [tex](1/2)^{4}=1/2^{4}=1/16[/tex] of it left.

So, [tex]1000/16=\boxed{62.5}[/tex].

2)

Because it has a half-life of 25 days, half of it will decay after 25 days.

After [tex]25*3=75[/tex] days, there will be [tex](1/2)^{3}=1/2^{3}=1/8[/tex] of it left.

So, [tex]400/8=\boxed{50}[/tex]

3)

Because it has a half-life of 25 days, half of it will decay after 25 days.

After [tex]25*2=50[/tex] days, there will be [tex](1/2)^2=1/2^{2}=1/4[/tex] of it left.

So, [tex]300/4=\boxed{75}[/tex].

4)

The only answer left is [tex]\boxed{100}[/tex] grams. You can solve it the same way you solved the previous steps.

Answer:

the length of DE is A) 18

Step-by-step explanation:

these triangles are similar so you need to create a proportion!

since sides DF and FE are the same, it means that AC and CB are the same!

now we have to find the hypotenuse for DE, which is X

- set up a proportion!

side AC/side AB = side DF/side DE ----> 15/27 = 10/x

- butterfly multiply to get 15x = 270

- divide both sides by 15 to isolate x

now you get --------> x = 18!

comment or message me if you are still confused or have a question!

Answer:

The answer is A

Step-by-step explanation:

Answer: hehehe

Step-by-step explanation:

Your mom

Answer:

49

Step-by-step explanation:

1/7^-2 is equal to 7^-2*-1 making it 7^2 which is equal to 49.

Answer:

5

Step-by-step explanation:

we first substitute the x

y= -2(-2-1)

=6

and then use a calculator to do the sum

which gives us 6

y= -2(-1-1)

= 4

y= -2(0-1)

=2

y= -2(1-1)

=0

y= -2(2-1)

=-2

Answer:

true

Step-by-step explanation:

figure B is figure A but 3 times the size.

Answer:

a c and e

Step-by-step explanation:

Answer:

$33,600

Step-by-step explanation:

2,800 x 12

Answer:C

Step-by-step explanation:

Answer:

the answer is 2143.57! hope this helps!

Answer:

f=-2.75

Step-by-step explanation:

2(f-2)=3(2f+5)-8

2f-4=6f+15-8

2f-6f=7+4

-4f=11

f=-11÷4

=-11/4=-2/3/4=-2.75

Answer:

c

Step-by-step explanation:

I hope this helps

Answer:

None of the above

Step-by-step explanation:

Notice the wording "which of the following statements MUST VE TRUE..."

From the figure, we see that two angles with vertex S are congruent to two angles with vertex at Q.

There is no indication the two angles at S are congruent. There is no indication the two angles at Q are congruent.

We are not told anything about angle measures.

Answer: None of the above

Answer:

y int.=5

slope=-7/4

Step-by-step explanation:

-7x-4y=-20

+7x       +7x

-4y=7x-20

/-4 /-4 /-4

y=-7/4x+5

Answer:

28

Step-by-step explanation:

14x2=28

Answer: 1 2/3

Step-by-step explanation: