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Westkost [7]
3 years ago
12

The difference 25(d−10)−23(d+6)25(d−10)−23(d+6) is

Mathematics
2 answers:
MArishka [77]3 years ago
8 0
25d - 250 | - 575d^2 + 2277d + 34362
Vlada [557]3 years ago
3 0

Answer: 2d - 388

Step-by-step explanation:

To expand the equation 25(d−10)−23(d+6)

We open the brackets first;

25d - 250 - 23d - 138

Collecting like terms

= 25d - 23d - 250 - 138

= 2d - 388

Therefore the difference is 2d - 388

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ABC is a tangent to the circle below. O is the centre of the circle. Work out the size of angle 0. Give reasoning to justify you
Delvig [45]

Answer:

Θ = 46°

Step-by-step explanation:

the angle between a tangent and a radius at the point of contact is 90° , so

∠ ABO = 90°

since OB = OD ( radii of circle ) then Δ BOD is isosceles and

∠ OBD = ∠ ODB = 22°

the exterior angle of a triangle is equal to the sum of the 2 opposite interior angles.

∠ AOB is an exterior angle of the triangle , then

∠ AOB = 22° + 22° = 44°

the sum of the 3 angles in Δ AOB = 180° , then

Θ + 44° + 90° = 180°

Θ + 134° = 180° ( subtract 134° from both sides )

Θ = 46°

6 0
1 year ago
30 POINTS! I NEED THIS TO BE DONE IN LESS THEN AN HOUR IF YOU CAN HELP PLEASE HELP ME ! then after these five questions i have a
igor_vitrenko [27]
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4 0
3 years ago
Find an explicit formula for the geometric sequence -40,-20,-10......
garik1379 [7]

Answer:

The explicit formula for the geometric sequence is c(n) = -40\cdot \left(\frac{1}{2} \right)^{n-1}.

Step-by-step explanation:

By definition of geometric sequence, we should use the following expression:

c(n) = c_{1}\cdot r^{n-1}, n \ge 1 (1)

Where:

c_{1} - First term.

r - Geometric rate.

n - Position of the element within the series.

If we know that c_{1} = -40 and r = \frac{1}{2}, then the explicit formula for the geometric sequence is:

c(n) = -40\cdot \left(\frac{1}{2} \right)^{n-1}

The explicit formula for the geometric sequence is c(n) = -40\cdot \left(\frac{1}{2} \right)^{n-1}.

3 0
3 years ago
Mary has three lengths of cable, 3/6 yard long, 1/4 yard long, and 1/3 yard long, which two pieces together make a length of 20/
nikitadnepr [17]

Answer:

3/6 + 1/3

Step-by-step explanation:

20/24 can be devided top and bottom by 4 which would equal 5/6, if you add 3/6 + 1/3 also equals 5/6.

7 0
3 years ago
Read 2 more answers
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Ksenya-84 [330]

Answer:

y=-x

Step-by-step explanation:

4 0
3 years ago
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