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andrew-mc [135]
3 years ago
14

A teacher had 21 red pens. if the ratio of red pens to blue pens she owned was 3:1 how many pens did she have total?

Mathematics
2 answers:
maw [93]3 years ago
8 0
29
i hope
i don't want u to get this wrong on a test or homework 
but as you see I'm trying
since i wasted my time on this website
Vlada [557]3 years ago
3 0
28 because….
21/7= 3
7x1=7
so 21+7=28
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Hep me on this please
Alona [7]

Answer:

The answer is 2240m².

Step-by-step explanation:

Given that the formula of area of trapezium is A = 1/2×(a+b)×h where a and b represents the length and h is height :

area =  \frac{1}{2}  \times (a + b) \times h

let \: a = 50 \\ let \: b = 90 \\ let \: h = 32

area =  \frac{1}{2}  \times (50 + 90) \times 32

area =  \frac{1}{2}  \times 140 \times 32

area = 70 \times 32

area = 2240 \:  {m}^{2}

5 0
3 years ago
Read 2 more answers
What is the total surface area of the rectangular pyramid whose net is shown?
Lunna [17]

Answer:

95 in.²

Step-by-step explanation:

Total surface area of the rectangular pyramid = 4(area of triangle) + area of rectangle

Area of triangle = ½*base*height

base = 5 in.

height = 7 in.

Area of triangle = ½*5*7 = 17.5 in.²

Area of rectangle = Length*width = 5*5 = 25 in.²

Plug in the values

Total surface area of the rectangular pyramid = 4(17.5) + 25

= 95 in.²

7 0
2 years ago
Pls help me I reallyyyyy don't understand
mash [69]

Answer:

9

Step-by-step explanation:

range is the range from the lowest # through the biggest # in other words subtract the smaller number from the bigger number

8 0
3 years ago
Given the graphs of y = 3x - 1 and y = -2x + 1, determine
lord [1]

Answer:

Такое тёплое место, но там, на улице,

Где ждут отпечатков наших ног,

Там сапоги сияют звёздной пылью.

Здесь пастыри и мягкое кресло,

Ослепительные сны под ярким солнечным шаром,

Курок не был нажат, когда было нужно.

Step-by-step explanation:

7 0
3 years ago
If 9 oz make 10 servings how many oz do I need to make 13 servings
Luden [163]
9/10 = x/13. Solve for x. X = 11.7.
Your answer would be 11.7oz. Hope this helps
4 0
3 years ago
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