Let a be a real number. Prove by contrapositive that if a+ 7x = 90, then a < 4.

Q: please check work thank you

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A: Proof. Let x ∈ R be idempotent, 

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Q: - In Exercises 13 to 28, construct a truth table for each compound statement. 13. ~p V9

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A: We can solve this using trigonometric and substitution of integration method

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Q: Let x be a real number. Prove by contrapositive that if x + 5x = 40, then x < 3.

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Q: What is the area, in square feet, of the rectangle shown below? 4 ft 6. ft 4 (A) 27- 20 11 в) 11 20 ...

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Q: 1. Perform the indicated operation: v-9 x v-343. A. 21 В. 21i С. -21i D. -21

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Q: KETCHPAD 등 =1 Write d Then show how this equation can be rewritten in two steps to write a formula f...

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Q: 1. Given the linear combination below, try to create a corresponding matrix representing it. Use col...

A: The representation of the above equation in matrix form is in the image below.  

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Q: Let * be the operation on the set of real number defined by a * b = 2a + 4b – ab. (a * b) * c = А. 2...

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A: here we will going to use two test  integral test for convergent /divergent  to check the series    ...

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Q: ate f(c(t)) and ds = ||c'(t)|| i te Sc ƒ(x,y, z) ds.

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A: We can solve this by using definition of polygon and regular of polygon

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Q: Which set of relation is a function? (9, 5), (10, 5), (9, -5), (10, -5) (3, 4), (4, -3), (7, 4), (3,...

A: To find which relation is a function . 

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Q: Use spherical coordinates to evaluate the triple integral /|| 2² + y² + 2² dV, where E is the ball: ...

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Q: 2. Describe general formulas or algorithms to do the following tasks: (a) Test whether a given matri...

A: We will use basic knowledge of geometry and linear algebra to answer both parts of this question.

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Q: 3) Determines whether the following series are absolute convergent, conditionally convergent or dive...

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Q: Evaluate the following integral: where D is the portion of unit circle in the 1 st quadrant. x? + y?...

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A: . 

Q: 1. Evaluate the following limits. r+ Vr* – 3r a. lim - Vr4 + 3x

A: Brief explanation is given below.

Q: Let x be a real number. Prove by contrapositive that if æ + 7x = 90, then x < 4.

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Q: х — 2 9. J x² (x – 1)2 4x

A: The given question is related with evaluation of an integral. We have to evaluate ∫ x - 2x2x-12 dx ....

Q: (sin(æ) + 2 cos(y)) dy ^ dz + (zổ – y cos(x)) dz A dæ + 11xyz dx ^ dy. Find dw. dw dx ^ dy ^ dz

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