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Kamila [148]
4 years ago
10

How to solve-3r+9=-4r+5

Mathematics
1 answer:
MakcuM [25]4 years ago
6 0
Subtract 5 from both sides then you get -3r+9=-4r then add 3r to both sides then you get 9=-1r then divide both sides by -1 and you get r=-9
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A ramp leading into a building makes a 15° angle with the ground. The end of the ramp is 10 feet from the base of the building.
Paul [167]

Answer:

10.4feet

Step-by-step explanation:

The set up wil form a right triangle

Length of the ramp is the hypotenuse

The length of the end of the ramp from the base= 10 feet (adjacent)

Angle of elevation = 15 degrees

Required

Length of the ramp

Using SOH CAH TOA

Cos  theta = adj/hyp

cos 15 = 10/L

L = 10/cos15

L = 10/0.9659

L = 10.35

L ≈ 10.4 feet

Hence the length of the ramp is 10.4feet

3 0
3 years ago
Read 2 more answers
Klaus was replacing the roof on his house. He used 420 nails to attach all the pieces of wood. Each piece of wood needed 7 nails
Sladkaya [172]

Answer:


20


Step-by-step explanation:


if 7 nails are required for each piece of wood, you must determine how much wood you have in total by dividing the amount of nails by 7.


If you have used 40 nails out of sixty, you 20 left because


60-40=20

4 0
3 years ago
4-8(-2-6t) if t = -1
oee [108]

Answer:

-16

Step-by-step explanation:

4-8= -4 (-2-6t) if t=-1 instead of t besides 6 put -1 multiplier it which it will become positive.

-4(-2+6)

-4x-2=8, -4x6= -24

8-24=-16

trust me i know that i am right

4 0
4 years ago
Given the following formula, solve for a.
mrs_skeptik [129]

Answer:

A

Step-by-step explanation:multiply both sides by two, then subtract b and c from both sides to get a on the right side by itself

6 0
2 years ago
Read 2 more answers
Please answer this correctly
miv72 [106K]

Answer: shade 85 squares

Step-by-step explanation:

34/40

convert that to a percentage

it will be 85%

there are 100 squares in the grid , so you shade 85 of them

4 0
4 years ago
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