Is 17 heartbeats in 15 seconds a unit rate? Why or why not?

1 answer:

8 0

No, because it is not per second. You would have to simplify to per one second for it to be a unit rate. Hope it helps! :)

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What is the area of triangle ABC ? round to the nearest square unit ?

mash [69]

Answer: 33 square units

Step-by-step explanation:

Given: Sides lengths of the triangle : 16 units, 10 units, 8 units.

Heron's formula:-

$\text{Area of triangle}=\sqrt{s(s-a)(s-b)(s-c)}$ , where s is the semiperter and a,b and c are the side-lengths of the triangle.

Let a=16 , b=10 and c=8

Then,

$s=\dfrac{a+b+c}{2}=\dfrac{16+10+8}{2}=17$

Using Heron's formula:-

$\text{Area of triangle}=\sqrt{17(17-16)(17-10)(17-8)}\\\\\Rightarrow\ \text{Area of triangle}=\sqrt{1071}=32.7261363439\approx33\text{ square units}$

5 0

3 years ago

I need help with 7, 10, and 13

Alexus [3.1K]

(2000 - 150) / 67
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(3000 - 400) /6
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(20 - 7) / .75
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6 0

3 years ago

The cost of eight stress balls and five T-shirts is $111.75. The cost of twelve stress balls and four T-shirts is $102.00. What

aksik [14]

Let's say stress ball cost x and t shirt cost y
8x+5y=111.75
12x+4y=102.00→3x+y=25.5→y=25.5-3x

8x+5(25.5-3x)= 111.75
8x+127.5-15x=111.75
-7x=-15.75
x=2.25

12x+4y=102
12(2.25)+4y=102
27+4y=102
4y=75
y=18.75

d is the correct answer

6 0

3 years ago

Stephen factored x2−10x 21 and found the answer to be (x 7)(x 3). Is he correct? Question 4 options: yes no.

STALIN [3.7K]

The true statement is that Stephen's factored expression is incorrect.

Given

The expression is given as:

$\rm x^2-10x+21$