找到你今天要练的题。

s =40+3tThe equation gives the speed s, in miles per hour, of a certain car t seconds after it began to accelerate. What is the speed, in miles per hour, of the car 5 seconds after it began to accelerate?

g(m) = −0.05m + 12.1The given function g models the number of gallons of gasoline that remains from a full gas tank in a car after driving m miles. According to the model, about how many gallons of gasoline are used to drive each mile?

The graph represents the total charge, in dollars, by an electrician for x hours of work. The electrician charges a onetime fee plus an hourly rate. What is the best interpretation of the slope of the graph?

Hana deposited a fixed amount into her bank account each month. The function f(t)= 100 + 25t gives the amount, in dollars, in Hana’s bank account after t monthly deposits. What is the best interpretation of 25 in this context?

which expression is equivalent to 7x²+8x ?

which expression is equivalent to
(x³ +3x²-6x )+4(x²+6)?

\( -14\left(3x-4\right)^2+8\left(3x-2\right)^2 \) 
The given expression can be rewritten as\( \frac{a}{6}x^2+\frac{b}{6}x+\frac{c}{6} \) , where a, b, and c are constants. What is the value of a+b+ c?

Which expression is equivalent to \( 2x^3+8x^2y+xy^2+4y^3\ ? \) 

Which expression is equivalent to \( 14\left(x^2-6\right) \) ?

Which of the following expressions is equivalent to\( 12x^{10}-12x^9+120x \) ?

\( \left(2x^2+8x-6\right)-\left(4x^2+7x\right) \) 
The given expression is equivalent to \( -2x^2+ax-6 \) , where a is a constant. What is the value of a?

0.27x² +0.72x ＋ 1.53
The given expression can be rewritten as a(3x²+ 8x +17), where a is a constant. what is the value of a?