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2 years ago

Multiply and show all steps please!!

Mathematics

2 answers:

Mazyrski [523]2 years ago

5 0

the answer is 80 take the positive and negative and use the sign change rule

garik1379 [7]2 years ago

4 0

Answer:

Step-by-step explanation:

First, find the square roots.

$\sqrt{-16} =4i$

$\sqrt{-64} =8i$

Remember: i stands for $\sqrt{-1}$

Then use the FOIL method to multiply.

(3+4i)(6-8i)

18-24i+24i-32i²

i²= -1, so :

18+32

I have no idea what the other person did, but its wrong.

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The area of a square is 225cm². On the map drawn to scale 1 : 3 find the area of the square

Olin [163]

Answer:

25 cm^2

Step-by-step explanation:

A scale drawing is a reduced form in terms of dimensions of an original image / building / object

the scale drawing is usually reduced at a constant dimension

scale of the drawing = original dimensions / dimensions of the scale drawing

Area if a square = length²

225 = length²

length = √225

length = 15

if the map is drawn to scale of 1 : 3

the length on the map = 15/3 = 5

area of the square 5 x 5 = 25

8 0

2 years ago

1/y = -3x/2+ 3 and rewrite it in the form of y = p/ q+x

Aleks [24]

1/y = -3x /2 + 3

mulytiply each term by 2y:-

2 = -3xy + 6y

y = 2 / -3( (x - 2)

y = -0.667 (-2 + x)

7 0

2 years ago

How do I solve this?

lubasha [3.4K]

Here is your answer to the question

8 0

2 years ago

Will give brainliest please help ASAP

icang [17]

480√3

How you a doin?

5 0

2 years ago

A drainage basin bordering the sea has an area of 7500 km2 . The average precipitation for this drainage basin is 900 mm year-1

Alexxx [7]

Answer with Step-by-step explanation:

The basic water balance dictates that "Amount of water flowing into the basin should be equal to the amount of water flowing out of it".

Mathematically

$Water_{in}=Water_{out}\\\\P=E+Q+I$

where

P = precipitation

I = Infiltration losses in the basin

E = Evapotranspiration

Q = is outflow from the basin

Applying the given values we get

$900=E+\frac{22.5\times 10^{8}}{7500\times 10^{6}}\times 1000+100\\\\900=E+300+100$

Part b)

From the above equation we get

$E=900-400=500mm/year$

The evaporation in cubic meters per year is

$E'=0.5\times 7500\times 10^{6}=3750\times 10^{6}m^3/year$

7 0

3 years ago