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2 years ago

Jean adds 35 and 9. How can she solve using only equations to model her thinking?

Mathematics

2 answers:

PIT_PIT [208]2 years ago

7 0

Add.
35 and 9
Answer: 45

LenKa [72]2 years ago

3 0

She can mostly add 35 and 9 and it will give you 44

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(57x2:3)+32x450-[39-(4+2):2[+8=

tigry1 [53]

Answer:

57×2/3+32×450-[39-4+2]/2+8

57×2/3+32×450-(39-6/2)+8

57×2/3+32×450-36+8

57×2/3+14400-28

57×2/3+14372

38+14372

14410

8 0

2 years ago

The length of each side of an equilateral triangle is increased by 20%, resulting in triangle ABC. If the length of each side of

kompoz [17]

Answer: Area of ΔABC is 2.25x the area of ΔDEF.

Step-by-step explanation: Because equilateral triangle has 3 equal sides, area is calculated as

$A=\frac{\sqrt{3} }{4} a^{2}$

with a as side of the triangle.

Triangle ABC is 20% bigger than the original, which means its side (a₁) measures, compared to the original:

a₁ = 1.2a

Then, its area is

$A_{1}=\frac{\sqrt{3} }{4}(1.2a)^{2}$

$A_{1}=\frac{\sqrt{3} }{4}1.44a^{2}$

Triangle DEF is 20% smaller than the original, which means its side is:

a₂ = 0.8a

So, area is

$A_{2}=\frac{\sqrt{3} }{4} (0.8a)^{2}$

$A_{2}=\frac{\sqrt{3} }{4} 0.64a^{2}$

Now, comparing areas:

$\frac{A_{1}}{A_{2}}= (\frac{\sqrt{3}.1.44a^{2} }{4})(\frac{4}{\sqrt{3}.0.64a^{2} } )$

$\frac{A_{1}}{A_{2}} =$ 2.25

The area of ΔABC is 2.25x greater than the area of ΔDEF.

7 0

2 years ago

2(z-3) <img src="https://tex.z-dn.net/?f=2%28z%20-%203%29%20%5Cgeqslant%205" id="TexFormula1" title="2(z - 3) \geqslant 5" al

Alenkinab [10]

Answer:

2z-6

Step-by-step explanation:

2(z-3)

2(z)-2(3)=2z-6

3 0

2 years ago

Help! Please help me find the measure of x, the missing angle shown below -

FromTheMoon [43]

Answer:

x=21.8

Step-by-step explanation:

The angles are complementary, and add to 90 degrees. We know this because of the little square in the corner.

x+68.2=90

Solve for x by isolating it. To do this , subtract 68.2 from both sides

x+68.2-68.2=90-68.2

x=21.8

3 0

2 years ago

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Simplify using the multiplication rule.

goldenfox [79]

A. the first one is the answer

Step-by-step explanation:

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2 years ago

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