3 years ago

Use a system of linear equations to find the quadratic function

Mathematics

1 answer:

Arada [10]3 years ago

8 0

Answer:

Step-by-step explanation:

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2 years ago

Mike takes 20 minutes longer than Erica does to make the 462-mile drive between two cities. Erica drives 3 miles an hour faster.

kkurt [141]

Answer with explanation:

Let speed of Mike =x miles an hour

Then, Speed of Erica=(x+3) miles an hour

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$\text{Speed}=\frac{\text{Distance}}{\text{Time}}\\\\ \frac{462}{x}-\frac{462}{x+3}=\frac{20}{60}\\\\462 \times 3\times (x+3-x)= x \times (x+3)\\\\x^2+3x=4158\\\\x^2+3x-4158=0\\\\x^2+66x-63x-4158=0\\\\x*(x+66)-63*(x+66)=0\\\\(x-63)(x+66)=0\\\\x\neq -66{\text{speed can't be negative}}\\\\x=63$

Speed of Mike=63 miles an hour

Speed of Erica=63+3=66 miles an hour

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4 years ago

A cube has a surface area of 2646 cm squared what is its volume

Dominik [7]

Answer:

9261

Step-by-step explanation:

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3 years ago

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