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3 years ago

What expression is equivalent to -7x+4+3x

Mathematics

1 answer:

Inessa [10]3 years ago

8 0

Answer:

$- 4x + 4$

Step-by-step explanation:

$-7x + 4 + 3x \\-7x + 3x + 4 \\- 4x + 4$

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A boat travels 36 miles in 1.5 hours ans then in 14 miles in 0.75 hour. what is the average speed?

allochka39001 [22]

The average speed can be obtained by the formula:

$V_{\text{average}}=\dfrac{\text{total distance}}{\text{total time}}.$

If a boat travels 36 miles in 1.5 hours ans then in 14 miles in 0.75 hour, then find:

total distance is 36+14=50 miles;
total time: 1.5+0.75=2.25 hours.

Therefore,

$V_{\text{average}}=\dfrac{50}{2.25}=\dfrac{5000}{225}=\dfrac{200}{9}=22.(2)$ miles per hour.

Answer: $V_{\text{average}}=\dfrac{200}{9}=22.(2)$ miles per hour.

6 0

3 years ago

Read 2 more answers

If f(3) = 9, what is f(1)<br>

Vaselesa [24]

Answer:

Step-by-step explanation:

3*3=9

1*3=3

8 0

3 years ago

Read 2 more answers

WILL MARK BRAINLIEST ANSWER!!! PLEASE HELP!! ripe pear falls from a tree and lands on the ground. As it hit the ground, the pear

r-ruslan [8.4K]

Answer:

13 feet

Step-by-step explanation:

3 0

3 years ago

Determine the value of $a$. [asy] pair w=(0,4); pair x=(0,0); pair y=(4,0); pair z=y+7/sqrt(2)*(1,1); dot(w); dot(x); dot(y); do

grandymaker [24]

Answer:

a=7

Step-by-step explanation:

The image is rendered and attached below.

Triangle WXY is an Isosceles right triangle, since WX=XY.

First, we determine the length of WY using Pythagoras Theorem.

$WY=\sqrt{4^2+4^2}\\WY=\sqrt{32}$

Since triangle WXY is Isosceles, $\angle XYW=45^\circ$

$\angle XYZ=\angle XYW+\angle WYZ\\135^\circ=45^\circ+\angle WYZ\\\angle WYZ=135^\circ-45^\circ=90^\circ$

Therefore:

Triangle WYZ is a right triangle with WZ as the hypothenuse.

Applying Pythagoras Theorem

$WZ^2=WY^2+YZ^2\\9^2=(\sqrt{32})^2+a^2\\a^2=81-32\\a^2=49\\a^2=7^2\\$Therefore: a=7$

3 0

3 years ago

The radius of a circle is 1 yard. What is the circle's circumference?<br> r=1 yd

matrenka [14]

Answer:

6.3 yards

Step-by-step explanation:

mathematically, to get the circumference of the circle, we will have to use the formula for the circumference of a circle

we have this as;

C = 2 * pi * r

r is 1 yard

c = 2 * pi * 1 = 2pi yards = 6.3 yards

5 0

2 years ago