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n200080 [17]
3 years ago
7

David used a scale 1 cm = 5 m to build a boat if the model is 8cm long , how long is the boat.

Mathematics
1 answer:
Pachacha [2.7K]3 years ago
3 0

Answer:

40m

Step-by-step explanation:

8 times 5

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Find an equation of the line passing through the given points (1,-3) and (3,3)
chubhunter [2.5K]

ANSWER: y= 3x - 6

STEP-BY-STEP EXPLANATION:

(1,-3) and (3,3)

X1=1           X2=3

Y1= - 3       Y2=3

1) Find the slope of the line.

To find the slope of the line passing through these two points we need to use the slope  formula:

m = \frac{Y2-Y1}{X2-X1}

m= \frac{3-(-3)}{3-1}   m=\frac{6}{2} = 3

2)Use the slope to find the y-intercept.

Now that we know the slope of the line is 3 we can plug the slope into the equation and  we get:

y= 3x+b

Next choose one of the two point to plug in for the values of x and y. It does not matter  which one of the two points you choose because you should get the same answer in either  case. I generally just choose the first point listed so I don’t have to worry about which  one I should choose.

y= 3x+b       point (1,-3)

-3= 3(1) + b

-3-3=b

-6=b

3)Write the answer.

Using the slope of 3 and the y-intercept of -6 the answer is:

y = 3x - 6

6 0
3 years ago
Elena needs to ship a 61 cm concert flute to a customer. She has two rectangular boxes. One is 25 cm by 25 cm by 50 cm. The othe
spin [16.1K]
A) V= lwh ,so, V= 25cm*25cm*50cm= 31250 cm^3 shape

b) V=lwh,so, V=10cm*12cm*58cm= 6960 cm^3 shape
c) It is a) because the volume is much bigger.
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3 years ago
A=pm+z solve for m<br> m=?
Leno4ka [110]
A=pm+z\\\\pm+z=A\ \ \ \ |subtract\ "z"\ from\ both\ sides\\\\pm=A-z\ \ \ \ |divide\ both\ sides\ by\ "p"\\\\\boxed{m=\frac{A-z}{p}}
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3 years ago
If Y varies directly with X solve the following :
BARSIC [14]

Answer:

a) x = -270

b) y = 304/9 or y = 33.78

c) x = -37.8

Step-by-step explanation:

y varies directly with x so y = kx

a)

y = kx

k = y/x

k = 10/-30 = -1/3

So

y = -1/3 x

If y = 90 then

90 = -1/3 x

x = 90 *(-3) = -270

b)

k = y/x

k = -19/-4.5

k = 38/9

So

y = 38/9 x

If x = - 8 then

y = 38/9 *(-8)

y = 304/9 or y = 33.78

c)

k = y/x

k = -4.3 / 12.9

k = - 1/3

So

y = -1/3 x

If y = 12.6 then

12.6 = -1/3 x

x = 12.6 *(-3)

x = -37.8

5 0
3 years ago
HELP ASAP PLEASE.
ValentinkaMS [17]

Answer:

pls give brainlist

Step-by-step explanation:

a. \frac{50 blocks (L)}{9 blocks(W)\\}  50 x 9 = 450. A=450

b. I can scale the unit rate of the area given above and largen the area of the map. Ex. \frac{7}{3}=\frac{21}{6} <---(scaled by 2)

Then we can enlarge it however we want so,

\frac{21}{6} = \frac{42}{12}  <--(scaled by 2 once more)

If the statement above is true then we can scale times 4.

\frac{7}{3}= \frac{42}{12}\\ <---(scaled by 4)

A= \frac{42}{12\\}

all i can give u at the moment , if u go on M a t h w a y it can help

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2 years ago
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