Questions in mathematics

Questions in mathematics

[Free] What is the value of $\sum_{n=12}^{73} n$?

[Free] Which of the following graphs correctly displays the data?

[Free] If $a(x)=2 x-4$ and $b(x)=x+2$, which of the following expressions produces a quadratic function? A. $(a b)(x)$ B. $\left(\frac{a}{b}\right)(x)$ C. $(a-b)(x)$ D. $(a+b)(x)$

[Free] Joaquin used the table to predict the cost of one year of education at a four-year public university. | Category | Predicted Cost | | -------- | -------------- | | tuition | $9,450 | | room and board | $7,920 | | transportation | $2,680 | | books and fees | $1,875 | | other | $930 | He received a grant for $1,900. What is the minimum amount Joaquin will need to contribute to his education annually if he chooses to live at home? A. $13,035 B. $14,935 C. $20,955 D. $22,855

[Free] A math student has a plan to solve the following system by the elimination method. To eliminate the $x$-terms, he wants to multiply the top equation by 7. What should he multiply the second equation by so that when he adds the equations, the $x$ terms are eliminated? [tex] \begin{array}{l} -3 x-7 y=-56 \\ -7 x+10 y=1 \end{array} [/tex]

[Free] Given: cos 20° = p. Without using p, find: 1. tan 70°? 2. sin 40°? 3. sin 50°?

[Free] Sarah transferred $450.00 from her savings account to her checking account. She'll use the check register to record her transaction. What will be her new balance? | | Date | Description of Transaction | (-) Debit | | (+) Deposits | Balance | | :------------ | :----------- | :----------------------------- | :---------- | :-- | :------------- | :------ | | Check number | | Beginning Balance | | | | 452.21 | | 258 | 4/1 | Phone Bill | 142.36 | | | 309.85 | | 259 | 4/7 | Groceries | 59.80 | | | 250.05 |

[Free] $\frac{\sqrt{72} \div 2}{2}$

[Free] Write the expression as an exponent with a base 2 and find its value: [tex]$2^6 \cdot 4$[/tex]

[Free] If $f(x)=|x|+9$ and $g(x)=-6$, which describes the range of $(f+g)(x)$? A. $(f+g)(x) \geq 3$ for all values of $x$ B. $(f+g)(x) \leq 3$ for all values of $x$ C. $(f+g)(x) \leq 6$ for all values of $x$ D. $(f+g)(x) \geq 6$ for all values of $x