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hichkok12 [17]
3 years ago
15

Make a 10 or 100 to subtract mentally 76_59

Mathematics
2 answers:
Sliva [168]3 years ago
8 0
17 is the answer. Hope i could help!
Thunderclan89
Maru [420]3 years ago
4 0
76-59=70+6-(60-1)=70+6-60+1=70-60+6+1=10+6+1=10+7=17
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KAJE PIERS' basketball court is rectangular with a length of 8x feet and a width of (x + 3) feet.
spayn [35]

The perimeter and area of the basketball court is 18x + 6 and 8x² + 24x respectively.

<h3>perimeter of a rectangle</h3>

  • Length = 8x
  • Width = (x + 3)

Perimeter of basketball court = 2(length + width)

= 2(8x + x + 3)

= 2(9x + 3)

= 18x + 6

Perimeter of basketball court = 18x + 6

Area of basketball court = length × width

= 8x × (x + 3)

= 8x² + 24x

Area of basketball court = 8x² + 24x

Learn more about perimeter of rectangle:

brainly.com/question/24571594

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3 0
3 years ago
The librarian at the local elementary school claims that, on average, the books in the library are more than 20 years old. To te
Cerrena [4.2K]

Answer:

<em>The observed t (2.533) is in the tail cut off by the critical t (2.462), therefore we reject H0. It is likely  that the books are older than 20 years of age on average.</em>

Step-by-step explanation:

<em>Step 1: Hypotheses and α level </em>

H0: μ ≤ 20

H1: μ > 20

<u><em>α = 0.01</em></u>

<em>Step 2: Critical region </em>

α = .01

One-tailed

df = n – 1 = 30 – 1 = 29

<u><em>t - critical = 2.462 </em></u>

<em>Step 3: Calculate t which is observed </em>

sM = √(s2 / n) = √(67.5 / 30) = 1.5

t = (M – μ) / sM  

t = (23.8 – 20) / 1.5

<u><em>t = 2.533 </em></u>

<u><em /></u>

3 0
3 years ago
Find the missing side or angle.
nikklg [1K]

9514 1404 393

Answer:

  41.1

Step-by-step explanation:

A triangle solver can do this nicely. b ≈ 41.1

__

You can use the law of cosines for the purpose.

  b² = a² +c² -2ac·cos(B)

  b² = 120² +110² -2(120)(110)·cos(20°) ≈ 1692.1148

  b ≈ √1692.1148 ≈ 41.13532

The missing side is b ≈ 41.1 units.

7 0
3 years ago
Malik invests money in an account paying simple interest. He invests $80 and no money is added or removed from the investment. A
xeze [42]

Answer:

  4%

Step-by-step explanation:

The interest earned on the investment is the difference between the end-of-year value and the initial value:

  $83.20 -80 = $3.20 . . . . simple interest per year

__

The interest rate is the ratio of this to the initial investment:

  $3.20/$80.00 = 0.04 = 4% . . . . . simple interest rate per year

4 0
2 years ago
What is the equation of this line?<br> y=4/5x+3 <br> y=4/5x−3 <br> y=−4/5x−3 <br> y=5/4x−3
Delicious77 [7]
Pretty sure y=4/5x-3
8 0
3 years ago
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