3 years ago

Lisa solved 3x2 + 1 = 28 as shown.

Mathematics

1 answer:

Alekssandra [29.7K]3 years ago

4 0

x squared = 9 NOT x

x = square roots of 9 which is +3 or -3.

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mart [117]

Answer:

2.0

Step-by-step explanation:

x = age

y = average systolic blood pressure

x₁ = 40 years old, y₁ = 110 systolic blood pressure

x₂ = 50 years old, y₂ = 130 systolic blood pressure

$\text{Slope of a line}=m=\frac{y_2-y_1}{x_2-x_1}\\\Rightarrow m= \frac{130-110}{50-40}\\\Rightarrow\frac{20}{10}\\\Rightarrow m= 2.0$

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Step-by-step explanation:

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What is the value of the expression 99 – 7a2 when a a = 3?

77julia77 [94]

Answer:

Step-by-step explanation:

plug in a=3 for a

I belive you meant 99- 7 * a^2

so 99- 7 * (3)^2 = 36

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3 years ago