2 years ago

39 less than twice a number is 5 times the sum of a number and two times the number. Find the number

Mathematics

1 answer:

umka2103 [35]2 years ago

3 0

$2n - 39 = 5(n + 2n)\\2n - 39 = 5(3n)\\2n - 39 = 15n\\2n = 15n + 39\\-13n = 39\\\\n = -3$

You might be interested in

For what value of r is the parallelogram a rhombus

Gre4nikov [31]

Answer:

Step-by-step explanation:

7r+18=r²

r²-7r-18=0

factorizing

r²+2r-9r-18=0

r(r+2)-9(r+2=0

(r-9)(r+2)=0

r-9=0

r=9

check

(r²)=(9*9)=81

7r+18=7(9) + 8=81

5 0

2 years ago

Round 0.9874 to the greatest non zero place

Anna71 [15]

0.9874 the greatest non zero place is 9 but the nearest digit is 8 when you round it off to 0.9 the answer becomes 1.0
0.9874~1.0

5 0

2 years ago

In the diagram of circle K, tangents are drawn from point A to points B and C on the circle. If arc mBC = 96, then what is the m

rjkz [21]

Answer:

∠A = 84°

Step-by-step explanation:

Since AB and AC are tangent to the circle, ∠ABK = 90° and ∠ACK = 90°.

Angles of a quadrilateral add up to 360°, so:

∠A + 90° + 90° + 96° = 360°

∠A = 84°

8 0

2 years ago

Simplify the expression 8 + (7 + x)

baherus [9]

Answer:

15 + x

Step-by-step explanation:

6 0

1 year ago

Milan has 4 times as many baseball cards as Richard. Together they have 125 baseball cards. How many cards does Milan have? How

Ilia_Sergeevich [38]

Answer:

Step-by-step explanation:

500

7 0

2 years ago

Read 2 more answers