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Rainbow [258]
4 years ago
6

kelly subtracted 2.3 from 20 and got 17.7, explain why this answer is reasonable. need by 5:30 today 9\15\15

Mathematics
1 answer:
Orlov [11]4 years ago
8 0
The answer is reasonable because 20-2.3 = 20 -(2+0.3) = 20-2 - 0.3 = 18 - 0.3 = 17.7
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A rectangle is 10 feet longer than it is wide. The area is 39 square feet. Find the dimensions of the rectangle​
soldi70 [24.7K]

Answer:

length = 13 ft

Width = 3 ft

Step-by-step explanation:

Width = w ft

Length = ( w +10 ) ft

Area = 39 square ft

length * width = 39

(w +10)* w = 39

w *w + 10*w = 39

w² + 10w - 39 = 0

w² + 13w - 3w - 3*13 = 0

w(w + 13) - 3(w + 13) = 0

(w + 13) (w - 3) = 0    {Ignore w + 13 , as measurement cannot be in negative}

w - 3 = 0

      w = 3

length = 3 +10 = 13 ft

5 0
4 years ago
Robert is running on a track that is 3 3 4 miles long. He has run 1 2 5 of a mile. How many more miles are there until Robert re
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Answer:

B.) 259 miles

5 0
3 years ago
Help me please, this is really hard.
Snowcat [4.5K]

The points of new triangle is (3,-2), (6,-3) and (2,-5).

<u>Step-by-step explanation:</u>

The given points in the triangle A(-3,7), B(9,3) and C(-7,-5).

The scale factor is \frac{1}{4} and centered at point (5,-5).

The formula to dilate a point that is not centered on a origin is given by,

D(x,y)=(h+t(x-h),k+t(y-t)).

where (h,k) is the center point.

To find A',

D(-3,7)=(5+\frac{1}{4}(-3-5),-5+\frac{1}{4}(7+5)).

D(-3,7)=(5+\frac{1}{4}(-8),-5+\frac{1}{4}(12)).

D(-3,7)=(5-2, -5+3).

D(-3,7)=(3,-2).

To find B',

D(9,3)=(5+\frac{1}{4}(9-5),-5+\frac{1}{4}(3+5)).

D(9,3)=(5+\frac{1}{4}(4),-5+\frac{1}{4}(8)).

D(9,3) = (5+1,-5+2).

D(9.3)=(6,-3).

To find C',

D(-7,-5)=(5+\frac{1}{4}(-7-5),-5+\frac{1}{4}(-5+5)).

D(-7,-5)=(5+\frac{1}{4}(-12),-5+\frac{1}{4}(0)).

D(-7,-5)=(5-3,-5+0).

D(-7,-5)=(2,-5).

∴ The points of new triangle is (3,-2), (6,-3) and (2,-5).

8 0
3 years ago
I need help on this one question ;(
Law Incorporation [45]

Answer:

C

Step-by-step explanation:

3 0
4 years ago
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Rudik [331]
Volume of a cylinder formula is
v = \pi {r}^{2}  \times h
v = 3.14 \times  {3}^{2}  \times 12
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