Question

wednesday week 10

1. the niagara falls gift shop kept a record of the number of post - cards sold over 7 days. what was the mean number sold per day?

s m t w th f s
450 275 0 300 350 480 575

1. choose the example of the identity property of addition.

(a + b)+c=a+(b + c) a + b=b + a a + b=b - a a+0=a

1. use mental math to solve. a french explorer saw the falls in 1613. sixty - five years later a belgian priest explored the area. what year did the priest see the falls?
2. estimate the length of segment st to the nearest half inch. then use a ruler to check your guess. estimate: _ inches actual: _ inches
3. match each figure below with the correct description.

a. a right triangle has a 90 - degree angle.
b. all of the sides in a scalene triangle have different lengths.
c. all the sides and all the angles of an equilateral triangle have the same measurement.
d. two sides and two angles of an isosceles triangle have the same measurement.
thursday week 10

1. write the numeral for five hundred seventy - six and three tenths.
2. is the answer correct if p = 12? 2p+4 = 24
3. erosion at niagara falls was once such a serious problem that the water’s edge was receding (being pushed back) three feet each year. at that rate, how many years would it have taken for niagara falls to recede 120 feet?
4. solve the problem. 3.5|4.62
5. which angle is most like the angle of the american falls?

Explanation:

Wednesday Week 10

Question 1

Step1: Recall mean formula

The mean $\bar{x}=\frac{\sum_{i = 1}^{n}x_{i}}{n}$, where $n = 7$ (number of days) and $x_{i}$ are the number of post - cards sold each day.

Step2: Calculate sum of post - cards

$\sum_{i=1}^{7}x_{i}=450 + 275+0 + 300+350+480+575=2430$.

Step3: Calculate the mean

$\bar{x}=\frac{2430}{7}=347.14$ (rounded to two decimal places).

The identity property of addition states that for any real number $a$, $a + 0=a$. The other options represent the associative property ($(a + b)+c=a+(b + c)$), the commutative property ($a + b=b + a$), and an incorrect operation ($a + b
eq b - a$).

Step1: Add years

The French explorer saw the falls in 1613. Sixty - five years later, we add 1613 and 65.
$1613+65 = 1678$.

Answer:

$347.14$

Question 2