The poetry club had its first bake sale, and they made $79.35. the club members are planning to have 4 more bake sales. leslie said, "if we make the same amount at each bake sale, we’ll earn $3,967.50." peggy said, "no way, leslie! we’ll earn $396.75 after five bake sales." use estimation to peggy explain why leslie’s reasoning is inaccurate. show your reasoning using words, numbers, or pictures.

During its first bake sale, the poetry club made $79.35. If we round up to $80, this will make it easier to estimate how much they will make if they have 4 more bake sales (5 altogether). Next, we should use multiplication to determine how much money they will earn altogether after 5 bake sales. Five times $80 equals $400. Leslie accidentally multiplies by 50 because she moves the decimal one place too far.

Estimation

Estimation is when you use an approximate calculation to make a prediction. It is important here to note that an estimation is different than guess. In both instances, one should use whatever knowledge is at their disposal; however, an estimation usually uses rounding and actual calculations.

Rounding

When making an estimation, rounding is an effective tool to use. Often numbers are rounded to the nearest whole number or place value. This can make it easier to do a quick calculation. In the word problem, the nearest whole number to 79.35 is 80. This makes it easier to multiply the dollar amount because there are fewer numbers to multiply.

Subject: Math

Level: middle school

Topic: Estimations

estimation, rounding, multiplication

Estimating with percents: link

Estimate: link

According to Question,

In first bake sale, Poetry club earned $79.35

Leslie has made calculation that if they have 4 more bake sales, they earn $3967.5

whereas according to Peggy after 5 bake sales they earn $396.75

First Let's check How much they will earn after 5 bake sales

Amount earned in 1bake sale =$79.35

So,Amount they will earn in 10 bake sales = 10 × 79.35 = $793.5( Simply shift a decimal to right)

Obviously, In 4 bake sales Amount earn < $793.5

But According to leslie they will earn $3967.5 >$793.5

So, Leslie reasoning is inaccurate

For More information,

For 5 bake sales they earn exactly 50%of $793.5

= $396.75 as told by Peggy

9) i can't see the angle so whatever it is just do this: cos(angle) x hypotenuse and then use that answer and they hypotenuse and plug it into this: (answer you just got)^2 + b^2 = (hypotenuse)^2. the first answer will be the answer of the adjacent side and the second answer after this equation will be the opposite side.

10) y = 14 x = √147 or 12.12435565

11) x = 4.8

12) x = 4.2

13) x = 9.3

14) pq: 13.2

qr : 17.6

angle p: 53º

15) angle c: 54.3º

angle a: 35.7º

16) h = 21040

v = 1841

step-by-step explanation:

10) 7/sin(30) = 14 = y

7^2 + b^2 = 14^2

49 + b^2 = 196

b^2 = 196 - 49

√b^2 = √147

x = √147

11) cos(70) x 14 = 4.788282007

x = 4.8

12) tan(25) x 9 = 4.196768923

x = 4.2

13) sin(31) x 18 = 9.270685348

x = 9.3

14) pq: sin(37) x 22 = 13.23993051

pq: 13.2

qr: cos(37) x 22 = 17.56998122

qr : 17.6

angle p: 180 - (37 + 90) = 53º

15) cos-1(7/12) = 54.31466529

angle c: 54.3º

angle a: 180 - (90 + 54.31466529) = 35.68533471

angle a: 35.7º

16) 4 x 5280 = 21120

cos(5) x 21120

h = 21039.63202

h = 21040

sin(5) x 21120

v = 1840.729287

v = 1841