3 years ago

What does “and” mean in math

Mathematics

2 answers:

Lady_Fox [76]3 years ago

6 0

“And” in math means to multiply in math

Sav [38]3 years ago

5 0

And means Addition in Math

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0.7x-y=4.22<br> 5-0.8x= 0.2y

Shtirlitz [24]

The solution of the set of equation is

x=6.217

y=0.132

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

given the set of equations

0.7x-y=4.22(1)

5-0.8x=0.2y

-0.8x-0.2y=-5 (2)

multiply (1) and(2) by 10

7x-10y=42.2(3)

-8x-2y=-50(4)

solve (3) and (4) using elimination method

$(4)\times 5$

⇒-40x-10y=-250(5)

(5)-(3)

-47x=-292.2

x=6.217

substituting value of x in 3

we get y=0.132

6 0

4 years ago

When full, the gas tank of a car holds 15 gallons. It now contains 12 gallons. What percent represenrs how full the tank is?

andrew-mc [135]

$15 \div 100 = 12 = x \\ step \: 1) \\ multiply \: the \: central \: numbers \\ 100 \times 12 = 1200 \\ step \: 2) \\ divide \: by \: 15 \\ 1200 \div 15 = 80 \\ 80\%$

8 0

3 years ago

Write the equation of the line passing through the point (3,5) with a slope of 2

Nady [450]

Y - y1 = m(x - x1)
y - 5 = 2(x - 3)
y - 5 = 2x - 6
y = 2x - 1

answer: equation y = 2x - 1

7 0

3 years ago

3 2/6 + ( 2 1/6 + 4/6 )

stellarik [79]

Answer:

5 7/6 or 6 1/6 either one works they are the same number just one is not simplified

3 0

4 years ago

Lisa and Daisy work at a hair salon. The salon charges $18 for a hair styling session with Lisa and $12 for a session with Daisy

Zina [86]

You would want to divide 216 by 18 and by doing that you would get 12.

5 0

4 years ago

Read 2 more answers